Police have detained a man they believe is the gunman who opened fire at a small Christian university in Oakland, Calif., Monday, killing at least seven people.

Shots were fired at about 10:30 a.m. at Oikos University.  Authorities confirmed seven fatalities.

"I can confirm that we do have one person who has been detained that we believe is possibly responsible for this shooting," Officer Johnna Watson said.

Video from the scene showed local police and a SWAT team surrounding a building. The suspected gunman is described as a heavyset, Korean man in his 40s wearing khaki clothing.

On the earlier video, one person could be seen carried out of the building while other gurneys were brought in.

"One of the people who was inside the building, she was saying there is a crazy guy inside," witness Brian Snow told KGO-TV.

"She did say someone got shot in the chest right next to her before she got taken off in an ambulance," he said.

According to KTVU-V the shooter is a former student and opened fire in a classroom.

The school's founder, Pastor Jong Kim, told the Oakland Tribune that he heard about 30 gunshots in the building and stayed in his office.

Oikos University was started about 10 years ago and offers classes in religious studies, music and nursing.