Kevin "Kayvon" Edson, 25, was sent to Bridgewater State Hospital and ordered held on USD 100,000 bail at an appearance in court on charges of threatening battery, possession of a hoax explosive device, threats to commit a crime, disturbing the peace, disturbing a public assembly and disorderly conduct.
His next court date was scheduled for May 7.
Edson's arrest occurred hours after ceremonies to mark last year's Boston Marathon bombings, in which two pressure cooker bombs hidden in backpacks exploded, killing three people near the finish line and injuring more than 260 others.
The backpack was destroyed. Police determined that the bag's contents were not explosive.
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Parsons The New School for Design and the Fashion Institute of Technology, both in New York City, confirmed that Edson had taken classes at their schools but never graduated.
The Massachusetts College of Art and Design posted a statement on its website saying that an undergraduate student had been arrested by police and the school was cooperating with authorities, but it did not mention Edson by name.
A second suspicious backpack also was found yesterday.
Officers determined it had been left behind by a media outlet and was not dangerous, but it too was destroyed. The backpacks rattled nerves days ahead of this year's marathon. Police kept people away from the finish line area for about three hours yesterday and trains bypassed the nearby Copley Square station.