A gunman killed two people and wounded nine others on Saturday at Brown University, plunging the eastern US campus into lockdown as hundreds of police hunted the suspect late into the night.

The streets around the university in the state of Rhode Island were filled with emergency vehicles hours after the gunfire at a building where exams were taking place.

The shooting 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

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