Officials say the suspect, a Columbia County teen, had planned to use a chlorine bomb to cause panic and then shoot patrons at the Three Rivers Mall in Kelso, Wash. before ultimately committing suicide.
The FBI received a tip about the plan on May 19 and identified the teen the following day. He was put under surveillance on May 20 and arrested on May 22.
According to authorities, the suspect had been making “very detailed plans” since early 2025 which included a route to the mall, a map the shooter would follow, a planned wardrobe with weapons, and annotated schematics for the improvised bomb.
Douglas Olson with FBI Portland said the plans had “an alarming number of indicators of a cogent path to violence” with no indications that the suspect would not follow through.
“This plot was as serious as it gets,” Olson said. “We, along with our partners, moved swiftly to interrupt this violent plan and to protect our community.”
The suspect reportedly pledged allegiance to multiple “online nihilistic extremist groups and ideologies.”
Watch the entire FBI press conference in the video player below.
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