Harvard University Police officers escort Kenneth Leong from the Science Center following his arrest on Jan. 18. Leong is accused of bursting into an auditorium filled with more than 250 students as the students were beginning work on a final exam. Witnesses say Leong hurled a brick against a blackboard and threatened to detonate a bomb. The building was evacuated but no explosives were found and nobody was injured. Leong was arraigned on various charges in Cambridge District Court and ordered to undergo 20 days of psychiatric evaluation at an area mental health facility.