Hours after negotiations between administrators and student leaders failed, police arrested dozens of people and cleared out protest encampments that spawned similar demonstrations at colleges around the world.

A large number of police officers descended on Hamilton Hall at Columbia University Tuesday night, evicting dozens of protesters who had occupied the building and taking many into custody. Tensions have flared at Columbia's Manhattan campus for the past two weeks,

There were no injuries or students nearby, and the bullet lodged in a wall. The matter is now under investigation.