Six people were injured on Wednesday in a shooting at an East Oakland, California, school campus, police said, according to a CNN report.

Authorities are still looking for those responsible, according to the report.

Officers responded to reports of a shooting just after 12:45 p.m. local time at a school campus that houses four different schools, Oakland Police Assistant Chief Darren Allison said in a Wednesday evening news conference.

The schools range from middle to high schools, the assistant chief said.

When officers arrived on scene they “immediately” made entry into the school and found six adults who had “some affiliation with the school” suffering from gunshot wounds, Allison said.

All six victims were transported to hospitals, including two who were suffering life-threatening injuries. A third victim has been released, two were pending release and the last victim was being treated for non-life threatening injuries.

Police are looking for at least one shooter though more people could be involved, Allison added.

The Oakland Unified School District said in a statement there was an incident at “the King Estate campus on Fontaine Street, which houses the co-located Rudsdale Continuation and Newcomer high schools, BayTech Charter School, and the headquarters of Sojourner Truth Independent Study, which has no students at the site.”

“The campus is near Oakland Academy of Knowledge (OAK), but it is important to note the incident was NOT at OAK, nor did it have anything to do with that elementary school,” the statement said.

The school campus has since been cleared by authorities, the assistant police chief said.

The office of California Gov. Gavin Newsom in a statement on Twitter called the shooting “a horrifying act of violence that has grown too familiar.”

“Yet again, our kids were in the crossfire. This cannot continue — gun violence has taken too much from our communities,” the governor’s statement added.