PINOLE - Two male juveniles who were arrested at Pinole Valley High School on Friday were allegedly found in possession of a concealed machine gun, Pinole police Detective Timothy Cauwels said today.

The two boys, both summer school students at the school, were arrested for possession of an illegal assault weapon, bringing a firearm onto school grounds, being a minor in possession of live ammunition, being a minor with a concealed weapon, transportation of marijuana, being a minor in possession of a firearm with prior convictions and a probation violation, Cauwels said.

The incident began just before 8 a.m. Friday when a passenger on an Alameda-Contra Costa Transit District bus heading to the school reported seeing another passenger, possibly a student, with a gun. The witness told police that the person with the gun might have brought it onto school grounds, police said Friday.

Pinole police, with assistance from the Hercules Police Department, the California Highway Patrol and the Contra Costa County Sheriff's office closed Pinole Valley Road, put the school, located at 2900 Pinole Valley Road, on lockdown and began searching the roughly 800 students attending summer school.

The two boys were allegedly found with the machine gun during the search and arrested, Cauwels said.

Once the other students were cleared, they were driven to Collins Elementary School at 1224 Pinole Valley Road, where their parents were able to pick them up, police said.

The high school remained on lockdown and the road remained closed until about 2:15 p.m., police said.

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