Residents of Ohio's fourth-largest city will have to wait a little longer to use their tap water.
Tests conducted by both the state and federal Environmental Protection Agency showed high levels of toxin levels in two neighborhoods in Toledo, Mayor D. Michael Collins said early Monday.
Instead of isolating the two neighborhoods, the Mayor said he'll keep the ban on drinking or using tap water in the entire city of Toledo until additional retests are completed. He declined to provide specifics on the name of neighborhoods in question and how high the toxin levels are.
"A majority of areas are satisfactory, but we have two areas of concern," he said at a news conference.
As many as 400,000 people were told not to consume, cook with or boil the tap water after a toxin called microcystin was found in the water supply Friday. Collins told reporters the advisories will remain in effect until further notice
Toledo's drinking water comes from Lake Erie, where a harmful algae bloom that causes microcystin has been growing.
The city has set up distribution centers for potable water, where members of the Ohio National Guard, fire officials and other first responders are giving out safe water.
About 350 Ohio National Guardsmen have been activated by the governor, according to a U.S. Defense Department official, adding that they have set up three Reverse Osmosis Water Purification Unit sites at two high schools and a police facility. The guardsmen have also delivered ready-to-eat meals, the official said.
MORE on CNN.com
Two women happened to turn on to kidnapping suspect Ariel Castro's street in the middle of the escape to freedom for three women held captive there for years.
– CNN's Susan Candiotti has the story
Two of the women found in Ariel Castro’s home, Amanda Berry and Gina DeJesus are back with their families. The third victim, Michelle Knight remains in the hospital – however doctors say she is in good condition.
One man who played a big role in bringing them home after their escape on Monday is Cleveland City Councilman Matt Zone. This morning he joins “Early Start” to discuss working very closely with the DeJesus and Knight families throughout their ordeal.
Thursday morning, new details continue to emerge regarding what went on inside the Seymour Avenue house where Amanda Berry and two others were held captive. The accused captor, Ariel Castro is now facing three counts of rape and four counts of kidnapping.
-CNN’s Pamela Brown reports
Three women who vanished without a trace a decade ago were found alive Monday night in a Cleveland neighborhood not far from where they were abducted. Three suspects, all brothers, are arrested and awaiting charges, police say. Amanda Berry is one of the victims who disappeared in three separate incidents between 2002 and 2004. It was her frantic, breathless 911 call that brought the ordeal to an end. This morning CNN’s Martin Savidge has the latest on the escape and the three women’s conditions.