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At least 10 people have been killed and more than 20 others injured in a shooting at Oregon’s Umpqua Community College.

Ray Shoufler, Douglas County Fire Marshal, told CNN the shooting occurred in a classroom in the science building.

Witnesses described hearing multiple shots and locking themselves in their classrooms. “We locked our door and I went out to lock up the rest rooms and could hear four shots from the front of campus”, said UCC Foundation Executive Director, Dennis O’Neill.

Douglas County Commissioner Chris Boice told CNN that the shooter is in custody, although the identity and whether the shooter is injured is unclear.

Umpqua Community College students live tweeted about an active shooter and ensuing frenzy on campus.

Omg there’s someone shooting on campus. — Kayla Marie (@KP_KaylaMarie) October 1, 2015

Students are running everywhere. Holy God. — Kayla Marie (@KP_KaylaMarie) October 1, 2015