Law enforcement sources close to the investigation told The Associated Press that at least five people have died after the morning shooting at Oikos University in Oakland.
Meanwhile, police said a suspect was detained in the attack. Officer Johnna Watson did not give any other details about the arrest. "I can confirm that we do have one person who has been detained that we believe is possibly responsible for this shooting," Watson said.
Four victims arrived at Highland Hospital for treatment, said spokeswoman Jerri Randrup. Earlier, television news footage showed officers surrounding the building in search of the suspect.
The footage also showed wounded people being carried out of the building, and more gurneys were being 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."
According of its website, Oikos University offers studies in theology, music, nursing and Asian medicine.