At least six people were shot and injured in a mass shooting at a school in Oakland in California. According to authorities at least three of them suffered life-threatening injuries, the shooting took place at 12.45 PM local time.

US gun violence: Shooting at California school campus leaves six injured

Oakland police Capt Casey Johnson said that at least six people were wounded, with two suffering life-threatening injuries, in a shooting at a northern California school campus on Wednesday.

California: At least six injured in school shooting, officials say

The teenager who gunned down two classmates at a California school last week before shooting himself used a "kit gun" that is untraceable, authorities said Thursday.

California school shooter used 'kit gun': Authorities

The shooting happened on the campus of Highland High School in Palmdale, California, around 7 a.m. PT, even as some students still were arriving at school

California shooting: Teenager used rifle, fired 10 shots in total

The suspect, described as a 'male Hispanic juvenile' by the LA County Sheriff's Department on Twitter, was not identified