The Latest search for killers of a Northern California high school student all times local):

2:55 p.m.

Northern California authorities say they are raiding a home near where a high school student was shot dead and a classmate wounded by three attackers.

The Marin County Sheriff's Office said Thursday that three law enforcement agencies stormed a home in Novato about 2:10 p.m. Novato is about 20 miles north of San Francisco across the Golden Gate Bridge. No arrests were immediately announced.

A sheriff's spokesman says the two Novato High School students were attacked Wednesday night on a quiet hiking trail at the edge of an upscale country club community. No motive has been announced. The school closed for the day Thursday

9:45 a.m.

Authorities say one student is dead and another hospitalized after a shooting and stabbing near a San Francisco Bay Area high school.

Marin County sheriff's Lt. Doug Pittman said Thursday that both victims were students at Novato High School in Marin County.

Their names and ages have not been released. Both students were shot and one was stabbed Wednesday evening.

Pittman would not say if arrests had been made in the case. A motive is not known. The school is closed Thursday.

Police say the incident occurred on a hiking trail at the edge of a country club community. Pittman says there is no threat to the community because the attack was an isolated incident involving a small group of people.

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Information from: Contra Costa Times, http://www.contracostatimes.com