Mohamed Osman Mohamud

*About 10,000 people were in Pioneer Courthouse Square when the authorities said a teenager hoped to detonate a car bomb.

The bomb, which was in a van parked off Pioneer Courthouse Square, was a fake – planted by F.B.I. agents as part of the elaborate sting – but “the threat was very real,” Arthur Balizan, the F.B.I.’s special agent in charge in Oregon, said in a statement released by the Department of Justice.

An estimated 10,000 people were at the ceremony on Friday night, the Portland police said.

Mr. Balizan identified the suspect as Mohamed Osman Mohamud, 19, a naturalized United States citizen. He graduated from Westview High School in Beaverton, Ore., a Portland suburb, and had been taking classes at Oregon State in Corvallis until Oct. 6, the university said Saturday.

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