The FBI thwarted a potential mass shooting by a teenager who planned to set off an explosive at a shopping mall in southwest Washington and shoot people as they fled the movie theater there, law enforcement leaders said Thursday.

A juvenile boy from Columbia County, Oregon, was arrested May 22 on state charges, according to the FBI. Authorities didn’t release his name.

The shooting was planned for the Three Rivers Crossing in Kelso, authorities said. The mall off Interstate 5 has a mix of national retailers including JCPenney, Target and Safeway, local businesses and Regal Cinemas, according to its website.

The teen had a map of the mall, a route to follow and a plan to use a chlorine bomb as a distraction to cause panic and then shoot people as they left the movie theater before killin

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