A Brown University instructor who was leading a final exam review has described the moment of horror that a masked gunman burst into his lecture hall and started shooting.

Joseph Oduro, a 21-year-old teaching assistant, told the New York Times that the gunman shouted “something” before opening fire, but he could not tell what.

Oduro was wrapping up a review session for Principles of Economics when they heard the shooter outside in the hall.

“All of a sudden, we heard gunshots and people screaming,” he said.

Within moments, a masked man with a rifle appeared in the doorway and opened fire .

Oduro said he and police are still trying to figure out what the attacker said during the shooting .

“That’s what the students and I — and the detectives — have been trying to piece toget

See Full Page