Six people were shot at a California school, authorities say

6 people were injured in an firing at an Oakland school Wednesday, authorities said.

The victims, all of whom were adults, were being treated at area hospitals, Mayor Libby Schaaf said on Twitter.

2 were in critical but stable condition, and a 3rd person was mentioned as stable at a local trauma hospital, said Alameda Health System CEO James Jackson.

A 4rth person suffered what Oakland Police Department Assistant Chief Darren Allison defined as semi injuries. 2 some were set to be released from a different hospital, he said.

The shooting occurred soon before 1 p.m. at a campus of four schools, including a middle and high school, in the city's Eastmont Hills neighbourhood, Allison told reporters.

The victims had "some connection" with Rudsdale, one of the schools. Schaff said sooner that the shooting began at Sojourner Truth, a K-12 independent study school also at the campus.

Victims were discovered inside the school, Allison said.  Allison did not identify a potential motive or suspect. Authorities are seeking for one gunman, though others may have been involved, he said.

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