Police on Thursday said they were still searching for at least two suspects in a shooting at an Oakland school campus Wednesday that they believe was gang-related.

Six people over the age of 18 were shot and taken to local hospitals, police said. Police believe the shooting was targeted, but it’s unclear what led to the incident.

Two students, two staff members, a counselor and a security guard were injured in the shooting. Oakland police Chief LeRonne Armstrong said at a news conference Thursday two of the victims were in critical but stable condition, one person was in stable condition, and three people were released from the hospital.

Oakland Police Department Assistant Chief Darren Allison said Wednesday 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.

Armstrong said authorities were looking for at least two shooters and another accomplice, but there may be more people involved, KGO-TV reported. Nobody was in custody as of Thursday. 

“The individuals who are responsible for this are still out in our community armed and dangerous,” Armstrong said.

Armstrong said the shooters were targeting a specific person and began to fire outside the school before breaching the front entryway. He said investigators are still working to determine what precipitated the shooting and who the shooters were targeting.

He called the incident “wholly unacceptable” and said more than 30 rounds were fired, which was likely gang-related, KGO-TV reported.

“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 on Wednesday. “The unbridled access to firearms in our country is inexcusable.”

SEPT. 27:1 killed, 4 injured after drive-by shooting near Philadelphia high school, authorities say