Hillsdale High School Bomb

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There was a bomb explosion at Hillsdale High School in San Mateo, CA this morning. The blast occurred around 8 a.m. outside a room where a sophomore history class was in session.Police investigators said a former student set off the pipe bomb. No motive has been known yet.The school was evacuated, and classes canceled for the day. Hillsdale High School is one of the biggest high schools in San Mateo with 1,200 students.