First a soldier guarding a hallowed war memorial was gunned down in Canada's capital. Then shots erupted in the halls of the country's Parliament minutes later.
The two shootings in Ottawa Wednesday left lawmakers barricaded inside offices and parts of the city on lockdown for hours as police searched for suspects.
Ottawa Police lifted the lockdown Wednesday night and said there was no longer a danger to the public.
But many questions remain about the shootings: Who was the gunman? Why did he open fire? And was he acting alone?
"It appears there was just one shooter, and that shooter is dead," Ottawa Mayor Jim Watson told CNN's Anderson Cooper. "But it has been a traumatic experience, obviously, for not only our city but the country."
Investigators haven't provided any possible motives for the shooting. Canadian Prime Minister Stephen Harper didn't provide details about the investigation in a televised address to the nation Wednesday night.
"In the days to come, we will learn more about the terrorist and any accomplices he may have had, but this week's events are a grim reminder that Canada is not immune to the types of terrorist attacks we have seen elsewhere in the world," Harper said. "Let there be no misunderstanding: We will not be intimidated. Canada will never be intimidated."
It is unclear whether additional suspects were tied to the shootings or whether additional arrests have been made. The Royal Canadian Mounted Police said more information would be provided in a press conference Thursday.
As authorities continued to investigate, details began to emerge about the man they suspect was behind the shooting.
Michael Zehaf-Bibeau was identified by Canadian officials to their American counterparts as the suspected gunman, multiple U.S. officials told CNN.
Bibeau, who was born in 1982, was a convert to Islam and had a history of drug use before he converted, two sources said.
His passport had been confiscated by Canadian authorities when they learned he planned to go fight overseas, a U.S. law enforcement official told CNN's Susan Candiotti. The official said it was not clear when that happened.
Canadian broadcaster CBC reported that Bibeau had a record of drug arrests going back 10 years.
See more on this developing story on CNN.com
A hospital official apologizes for blunders in handling Ebola. Schools close for fear of possible exposure. And health officials consider putting 76 hospital workers on a no-fly list after an infected nurse flew on a plane with a fever.
Here's the latest on the Ebola in the United States:
Hospital official: 'We are deeply sorry'
The Texas hospital where an Ebola patient died and two nurses became infected is apologizing for mistakes made when first confronted with the deadly virus.
Dr. Daniel Varga said the hospital mishandled the case of Thomas Eric Duncan, the Ebola patient who was originally sent home from Texas Presbyterian Health Dallas hospital even after he had a fever and said he was from Liberia.
"Unfortunately, in our initial treatment of Mr. Duncan, despite our best intentions and a highly skilled medical team, we made mistakes," Varga, the chief clinical officer for Texas Health Services, said in written testimony to the House Energy and Commerce Committee.
"We did not correctly diagnose his symptoms as those of Ebola. We are deeply sorry."
Days after Duncan returned to the hospital, he died from the virus.
But Varga did outline a timeline of the hospital's preparation, saying hospital staffers were given guidance on looking for Ebola symptoms several times over the summer.
He said the hospital has made several policy changes, such as updating the emergency department screening process to include a patient's travel history and increasing training for staffers.
CDC considers grounding Texas hospital workers
The Centers for Disease Control and Prevention is now considering putting 76 health care workers at Texas Health Presbyterian Dallas on the Transportation Security Administration's no-fly list, an official familiar with the situation said.
The official also said the CDC is considering lowering the fever threshold that would be considered a possible sign of Ebola. The current threshold is 100.4 degrees Fahrenheit.
The idea came after news that Amber Vinson, a nurse who cared for Duncan, flew home from Cleveland to Dallas after reporting a fever.
Vinson called the CDC to report an elevated temperature of 99.5 Fahrenheit. She informed the agency that she was getting on a plane, a federal official told CNN, but she wasn't told to stay grounded.
Vinson, 29, is now being treated at Emory University Hospital in Atlanta, which has successfully treated two other patients.
Staffing issues at the hospital were behind the decision to transfer Vinson to Emory, a federal official told CNN Chief Medical Correspondent Dr. Sanjay Gupta.
"What we're hearing is that they are worried about staffing issues and a possible walkout of nurses," the official said.
See more on this developing story on CNN.com
A U.S. airstrike near Baghdad on Monday marked a new phase in the fight against ISIS.
The airstrike southwest of the city appears to be the closest the U.S. airstrikes have come to the capital of Iraq since the start of the campaign against ISIS, a senior U.S. military official told CNN. And U.S. Central Command said in a statement that it was the first strike as part of "expanded efforts" to help Iraqi forces on the offensive against ISIS.
Monday's airstrike destroyed an ISIS fighting position that had been firing at Iraqi forces, Central Command said.
It occurred about 35 km (22 miles) southwest of Baghdad, another U.S. official said.
The United States began targeted airstrikes against ISIS in Iraq last month to protect American personnel and support humanitarian missions. Last week, U.S. President Barack Obama said new airstrikes would aim to help Iraqi forces on the offensive against the Islamist militants.
Obama also said airstrikes would include ISIS targets in Syria. And last week he also asked Congress for authorization to train and equip moderate Syrian rebels.
The authority comes under Title 10 of the U.S. code, which deals with military powers, and Congress could vote on granting it this week. Approval also would allow the United States to accept money from other countries for backing the Syrian opposition forces.
A senior administration official told reporters Monday that Obama has been making calls to Democratic and Republican members of Congress, asking them to pass the authorization.
U.S. Secretary of State John Kerry courted Middle Eastern leaders over the weekend to join a coalition in the fight against the Islamist militant group, which calls itself the Islamic State.
More than two dozen nations, the Arab League, the European Union and United Nations met in the French capital Monday, calling ISIS a threat to the international community and agreeing to "ensure that the culprits are brought to justice."
The United States has conducted more than 150 airstrikes in Iraq against ISIS, and Kerry has said nearly 40 nations have agreed to contribute to the fight against the militants. But it remains unclear which countries are on that list and the precise roles they'll play.
See more on this developing story on CNN.com
Rescuers pulled stranded riders from a roller coaster at Six Flags America in Maryland on Sunday after the ride halted on the tracks.
A train on the Joker's Jinx roller coaster stopped near the top of the 79-foot-tall ride, fire officials said. It took more than four hours to get all 24 passengers back on the ground.
No one was injured, Six Flags spokeswoman Debbie Evans said.
Video from CNN affiliate WJLA showed rescuers slowly helping passengers to safety, one by one. Hours after the rescue operation began, Prince George's County Fire Chief Marc Bashoor said all passengers were safe.
He posted a series of photos of the dramatic rescue on Twitter.
"Firefighters have reached the 1st car by tower bucket – each of 6 cars will be emptied slowly," he wrote.
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After spending days exposed to the elements on a Ukrainian field and then inside refrigerated train cars, the first group of victims from Malaysia Airlines Flight 17 are one step closer to home.
The first plane carrying the remains of some victims are expected to arrive in the Dutch city of Eindhoven on Wednesday.
The arrival will mark a homecoming for many of the victims. Most of the 298 people on board the plane were from the Netherlands, which has declared Wednesday a national day of mourning.
Dutch royals, government officials and families of the passengers will be at the tarmac when the remains arrive. After a solemn ceremony, the bodies will be taken to a military facility for forensic testing.
But Dutch Prime Minister Mark Rutte said it could take weeks or even months to identify the remains.
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A train carrying 282 bodies from Malaysia Airlines Flight 17 arrived in Kharkiv, Ukraine, getting the bodies one step closer to their grieving families around the world.
The train arrived at a rail station and continued on to an undisclosed location. The bodies will eventually be taken to the Netherlands.
But a litany of obstacles remain - not just in handling the remains, but in figuring out how and why MH17 was shot down over eastern Ukraine.
See more on this developing story on CNN.com.
There's no shortage of evidence that shows pro-Russian rebels shot down a Malaysian jet in Ukraine last week, U.S. Secretary of State John Kerry said.
Malaysia Airlines Flight 17 fell from the sky in Donetsk on Thursday, killing all 298 people aboard.
There's video of a launcher with one surface-to-air missile missing, imagery showing the firing and intercepted calls with rebels claiming credit for the strike, Kerry said.
"We know from intercepts ... that those are in fact the voices of separatists," he told CNN's State of the Union on Sunday. "And now we have a video showing a launcher moving back through a particular area there out into Russia with at least one missing missile on it."
Kerry accused Russia of backing the separatists.
"This is the moment of truth for Russia. Russia is supporting these separatists. Russia is arming these separatists. Russia is training these separatists. And Russia has not yet done the things necessary in order to try to bring them under control," he said.
British Prime Minister David Cameron didn't mince words either on who was to blame. In an op-ed in The Sunday Times, he called the plane crash and its aftermath "an outrage made in Moscow."
Russian President Vladimir Putin fired back with a video statement posted on the Kremlin's official website early Monday, arguing that his country has been pushing for peace in Ukraine.
"We have repeatedly called on all parties to immediately stop the bloodshed and to sit down at the negotiating table. We can confidently say that if June 28 fighting in eastern Ukraine did not resume, this tragedy most likely would not have happened," he said. "However, no one should have the right to use this tragedy to achieve selfish political objectives. Such events should not divide but unite people."
He stressed that safety must be guaranteed for international experts investigating the crash.
"We must do everything to ensure their work has full and absolute security (and) ensure necessary humanitarian corridors are provided," Putin said.
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A Malaysia Airlines passenger jet crashed in a rebel-controlled part of eastern Ukraine on Thursday, spurring swift accusations from Ukrainian officials that "terrorists" shot down the aircraft.
The United States has concluded a missile shot down the plane, but hasn't pinpointed who was responsible, a senior U.S. official told CNN's Barbara Starr.
The Boeing 777 with 298 people aboard fell from the sky near the town of Torez in the Donetsk region of eastern Ukraine, officials said. A top Ukrainian official said the plane, which was on the way from Amsterdam to Kuala Lumpur, was flying at about 10,000 meters (nearly 33,000 feet) when the missile hit.
A radar system saw a surface-to-air missile system turn on and track an aircraft right before the plane went down, the senior U.S. official said. A second system saw a heat signature at the time the airliner was hit, the official said. The United States is analyzing the trajectory of the missile to try to learn where the attack came from, the official said.
The Obama administration believes Ukraine did not have the capability in the region - let alone the motivation - to shoot down the plane, a U.S. official told CNN's Jake Tapper.
Malaysian Prime Minister Najib Razak said the plane never made a distress call.
He called for an international team to have full access to the crash site.
"We must and we will find out precisely what happened to this flight. No stone will be left unturned," he said.
"If it transpires that the plane was indeed shot down, we insist that the perpetrators must swiftly be brought to justice," Najib said.
Ukrainian officials maintained that pro-Russian separatists were behind the crash.
You can follow the updating story at CNN.com
Magic Johnson has some advice for Los Angeles Clippers owner Donald Sterling: Sell the team, take the money and enjoy the rest of your life.
A day after Sterling appeared on CNN slamming the NBA legend's character, his battle with HIV and his community outreach efforts, Johnson said Tuesday that he feels sorry for the 80-year-old billionaire.
"It's sad. It really is. I'm going to pray for this ... man," Johnson told CNN's Anderson Cooper in an exclusive interview.
Sterling's explosive CNN interview that aired Monday night was the first time he had spoken publicly since audio recordings surfaced last month of him making racist remarks. Reaction to the taped remarks came fast and furious, and the NBA responded with a lifetime ban for Sterling.
Johnson became an involuntary figure in the controversy after Sterling named him in the leaked recording.
"Admire him, bring him here, feed him, f**k him, but don't put (Magic) on an Instagram for the world to have to see so they have to call me," Sterling is heard telling friend V. Stiviano.
Johnson told Cooper he is still waiting for an apology from Sterling for getting roped into Sterling's fight with Stiviano, and Johnson called the Monday interview - in which Sterling directed another tirade at the NBA legend - "disturbing."
"What's really sad is, it's not about me," Johnson said. "This is about the woman you love outing you and taping you and putting your conversation out here for everybody to know. ... This is between you two, but then he wants to include me."
Johnson said he had only met with Sterling three or four times, and most of those discussions had focused on basketball. Johnson couldn't say if the Clippers owner has slipped mentally.
Sterling "seems like he's all there," Johnson said. "But the problem is, he's living in the stone ages."
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A Missouri man, with a long virulent history of anti-Semitism, is suspected of killing a boy and his grandfather outside a Jewish community center in Kansas City, and a woman at a Jewish assisted living facility nearby.
While police in Overland Park, Kansas, stopped short of labeling the Sunday attacks a hate crime until they were further along in their investigation, the suspect - Frazier Glenn Miller - is the founder and former leader of the Carolina Knights of the Ku Klux Klan and the White Patriot Party.
Both operated as paramilitary organizations in the 1980s, according to the Southern Poverty Law Center, which monitors hate groups.
The 73-year-old Miller, who also goes by Frazier Glenn Cross, faces charges of premeditated first-degree murder. He is expected to appear in court Monday.
The shootings took place at the Jewish Community Center of Greater Kansas City in Overland Park and at the Village Shalom Retirement Community in Leawood - a day before the start of Passover, the major Jewish spring festival.
"The timing is terrible. The timing is awful," said Rabbi Herbert Mandl, a chaplain for the Overland Park police.
In all, the gunman shot at five people, none of whom he's believed to have known, said Overland Park Police Chief John Douglass.
Three people died; the other two were not injured.
Shortly afterward, authorities arrested the suspect at a nearby elementary school.
Video from CNN affiliate KMBC showed the suspect sitting in the back of a patrol car and shouting, "Heil Hitler."
Douglass said police were investigating statements the man made after his arrest, but declined to provide additional details.
The Anti-Defamation League said it warned last week of the increased possibility of violent attacks against community centers during the coming weeks, "which coincide both with the Passover holiday and Hitler's birthday on April 20, a day around which in the United States has historically been marked by extremist acts of violence and terrorism."
'This has left us all breathless'
The shooting began just after 1 p.m. Sunday in the Jewish community center's parking lot.
Inside the center was a hive of activity. A rehearsal for a production of "To Kill a Mockingbird" was underway as were auditions for "KC Superstar," an "American Idol"-style contest for the best high school singer in the Kansas City area.
Outside, the gunman opened fire. Police said he was armed with a shotgun and may have been carrying other weapons.
Reat Griffin Underwood, 14, was coming to audition for the singing competition. His grandfather, William Lewis Corporon, was driving him. The bullets struck them in their car. Both died.
Corporon was a doctor who practiced family medicine in Oklahoma for many years before moving to Kansas City to be closer to his grandchildren.
"He cherished his family," the family said in a statement.
Reat was a high school freshman who was active in debate, theater and had "a beautiful voice," his family.
At a vigil Sunday night at the United Methodist Church of the Resurrection, Reat's mom walked up to the podium and introduced herself as the mother and daughter of the community center victims. The gathered gasped.
"I know that they're in heaven together," the mother, Mindy Corporon, said.
Jacob Schreiber, president of the community center, remembered the family fondly.
"This is one of the nicest, kindest, most supportive families that we have here," he said. "This has left us all breathless."
The center immediately went into lockdown.
"Some of these kids were taken into locker rooms and told to lay on the floor as the shots rang out," CNN affiliate KSHB reporter Lisa Benson told CNN.
Jeff Nessel, a parent, told the Kansas City Star he had just dropped his 10-year-old son off at the community center when a staff member told him to get back inside because there had been a shooting.
"We'll keep you on lockdown. You're safe here," Nessel said a staff member told him.
'Stay away from the windows'
The gunman then drove to the retirement home, where he shot the third victim in the parking lot. She has not been identified.
Amy Rasmussen was helping with her grandmother's laundry when residents were warned by a staff member.
People "were told by one of the staff that it was a tornado warning ... and stay away from the windows," Rasmussen told the newspaper.
'A raging anti-Semite'
Miller, the suspected shooter, is a "raging anti-Semite," who has posted extensively in online forums that advocates exterminating Jews, the Southern Poverty Law Center (the SPLC) said.
He has called Jews "swarthy, hairy, bow-legged, beady-eyed, parasitic midgets."
According to the SPLC, Miller founded and ran the Carolina Knights of the Ku Klux Klan in the 1980s. He was forced to shut down after the SPLC sued him for operating an illegal paramilitary organization and intimidating African-Americans.
He then formed another group, the White Patriot Party.
In the late 1980s, Miller spent three years in prison on weapons charges and for plotting the assassination of SPLC founder Morris Dees. The short sentence was a result of a plea bargain he struck with federal prosecutors. In exchange, he testified against 14 white supremacists in a sedition trial in Arkansas in 1988.
"He was reviled in white supremacist circles as a 'race traitor and, for a while, kept a low profile," according to an SPLC profile of him. "Now he's making a comeback with The Aryan Alternative, a racist tabloid he's been printing since 2005."