PORTLAND, Ore. (KTVZ) -- The FBI's Portland Field Office and law enforcement partners announced Thursday they arrested a Columbia County, Oregon, juvenile who conspired last month to conduct an improvised explosive attack and mass shooting at the Three Rivers Mall in Kelso, Washington.

Here's the FBI's full statement on the planned attack and the arrest:

The teen, whose name will not be released due to an effort to limit public disclosure of a minor, was arrested on the morning of Tuesday, May 22, by deputies from the Columbia County Sheriff’s Office.

The detailed and imminent attack plans were reported to the FBI on May 19. Immediately, the FBI began working with our partners to identify the suspect who was responsible for the threat.

The subject was identified the next day, May 20, a

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