A Portland, Ore.-area teen was taken into custody Friday after attempting a plot to bomb the Christmas tree-lighting ceremony in Pioneer Courthouse Square, the Portland Tribune reported.
Mohamed Osman Mohamud, a naturalized U.S. citizen from Somalia, had been watched for months as his alleged bomb threat was developing.
The Pioneer Press reports the FBI said Mohamud had previously said he wanted to kill Americans.
Mohamud will be charged Monday in Portland's federal court. Mohamud could face a maximum sentence of life in prison and a $250,000 fine if he is guilty, the Portland Tribune reports.