Several hundred students were briefly evacuated from York University Sunday afternoon for an unspecified police investigation.

Police said 400 to 500 students were taken out of Curtis Lecture Halls at the Keele campus just before lunchtime, and were allowed back about around 1 p.m.

York University is currently in its fall 2010 exam period, and exams were scheduled Sunday, according to police.

This is the second major disruption at York University in the past week, after a fire cut heating to residences Monday, cancelling exams for Monday and Tuesday.