The plot, described by one official as being “as serious as it gets,” involved a plan to shoot moviegoers at a Washington State mall as they fled an explosion.

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.

This plot was as serious as it gets,' FBI says 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,