Hundreds of police officers hunted Sunday for a gunman who killed two people and wounded nine others at Brown University, plunging the eastern US campus into lockdown.

The streets around the university in Providence, Rhode Island were filled with emergency vehicles hours after the shooter opened fire Saturday at a building where exams were taking place.

The violence is the latest in a long line of school attacks in the United States, where attempts to restrict access to firearms face political deadlock.

Witness Katie Sun told the Brown Daily Herald student newspaper she was studying in a nearby building when she heard gunfire. She ran to her dorm, leaving all her belongings behind.

"It was honestly quite terrifying. The shots seemed like they were coming from... where the classrooms ar

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