Six people were injured in a shooting at a school in east Oakland, California, on Wednesday, police said. 

All six victims had gunshot wounds and were transported to local hospitals, the Oakland Police Department said at a press conference. They were all adults believed to be affiliated with the school, Oakland Police Department Assistant Chief Darren Allison said, though officials did not say if any were students aged 18 or older.

Allison said the shooting happened at about 12:45 p.m. at the Rudsdale Newcomer High School portion of the King Estates campus, which houses four schools that also include Sojourner Truth Independent Study and BayTech Charter School. Investigators are working to determine how the shooting progressed, Allison said, noting that some victims were located inside the building.

“Today’s gun violence at Sojourner Truth school shocks the soul — our schools are sanctuaries for our children,” Oakland Mayor Libby Schaaf said in a tweet. “The unbridled access to firearms in our country is inexcusable.”

Two victims had life-threatening injuries and one person had been released from the hospital as of Wednesday afternoon, Allison said at a press conference. Two others were pending release from the hospital and the last victim had non-life threatening injuries.

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Allison said officials were looking for at least one shooter, though he said more suspects could be involved. Nobody was in custody yet on Wednesday. The school was cleared and the situation is not active, officials said.