From OregonLive.com:

Mohamed Osman Mohamud, 19, a Somali-born U.S. citizen, was arrested at 5:42 p.m., 18 minutes before the tree lighting was to occur, on an accusation of attempting to use a weapon of mass destruction. The felony charge carries a maximum sentence of life in prison and a $250,000 fine.

“This defendant’s chilling determination is a stark reminder that there are people — even here in Oregon — who are determined to kill Americans,” said Oregon U.S. Attorney Dwight Holton. “The good work of law enforcement protected Oregonians in this case — and we have no reason to believe there is any continuing threat arising from this case.”

Since the perpetrator was naturalized I would like him stripped of his citizenship.