MOUNT VERNON - A Mount Vernon high school has been shut down for the day after a bomb threat was called into the school.

Police say the threat was called in at around 11 a.m. at the Nelson Mandela High School on Gramatan Avenue. Police closed off part of Fifth Avenue between Gramatan and Lincoln avenues as they investigated.

Students at the high school have been dismissed early.

Bomb squad members and K9 units went classroom to classroom to clear the building but nothing was found.