(CNN) — An Oregon teen has been arrested in connection with an alleged mass shooting plot targeting the Three Rivers Mall in Kelso, in southwestern Washington, officials said.

The suspect, whose identity has not been disclosed due to their age, allegedly planned to detonate a chlorine bomb to create chaos and panic before shooting fleeing patrons exiting a movie theater, the FBI Portland Field Office said in a statement . The Columbia County, Oregon, Sheriff’s Office arrested the suspect on May 22, the FBI said.

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