SAN PABLO, Calif. -- A 12-year-old boy has been charged with felony forced oral copulation in the assault of a 14-year-old girl, police said Monday. The boy, whose name was not released because he is a juvenile, was among four boys who allegedly tackled the girl Thursday on the playground at Helms Middle School, said San Pablo police Sgt. Mark Foisie. The three boys allegedly held the girl down as the 12-year-old assaulted her, Foisie said. The other suspects, two 13-year-olds and a 14-year-old, were released pending further investigation. All four are students at the school, police said.