A teenager in Columbia County, Oregon, was arrested by the FBI and local law enforcement after he conspired to conduct an improvised explosive attack and mass shooting at a mall in Washington.

The teen was arrested on Thursday, May 22, after his threats against the Three Rivers Mall, the FBI Portland Field Office said.

The FBI said it first learned of the teen’s attack plans on Monday, May 19. The juvenile was identified as a person who shared nihilistic violent extremist ideology and the plans in online chats.

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