New Jersey's largest mall is set to re-open Wednesday.

It's been shuttered since gunman Richard Shoop, 20, opened fire there on Monday night.

Police now say Shoop was not out to harm anyone except himself as he committed suicide in a corner of the massive mall.

This morning, we are learning new details about the incident and what may have sparked it, CNN's Jason Carroll reports.

The gunman who opened fire at a New Jersey mall Monday night is dead, authorities said. The shooter's body was discovered at 3:20 a.m. in a back area of the mall, CNN's Nic Robertson reports.

Bergen County Prosecutor John Molinelli confirms that Garden State Plaza Mall suspect, Richard Shoop, of Teaneck, New Jersey, is dead.

The shooting sent panic through the shopping center shortly before closing time and set off a frenzied hunt for the gunman. In the early hours of the search, officials weren't sure whether the shooter was still inside or outside the 2-million-square-foot building.

The melee started around 9:20 p.m. ET. Witnesses said the shooter appeared calm as he worked his way through the mall with a rifle. The gunman apparently fired shots at security cameras, state police said.