BELLINGHAM, Wash. (AP) _ A teen-ager with a history of making explosives died Tuesday after a bomb went off as he placed it in a McDonald's restaurant bathroom, police said.

Craig Oseroff, 16, died at St. Joseph Hospital after surgery following the explosion Monday.

''It appears it was ... a homemade device made by the victim himself,'' Bellingham Police Sgt. Terry West said. ''He appears to have been planting it in the restroom when it inadvertently exploded.''

The blast ''completely blew the toilet apart,'' Deputy Police Chief Duane Schenck said.

Damage was mostly limited to the bathroom. Two men in the room when the device exploded were not hurt. The restaurant reopened Tuesday.

Oseroff was conscious after the explosion and didn't admit making the bomb, West said.

The boy had moved to live with his mother just three weeks ago. He had been living with his father in Camano Island, about 40 miles south of Bellingham.

He ''had a history of making homemade explosives,'' West said, but there was no evidence he was targeting the restaurant because of any grudge.