CALAVERAS COUNTY, Calif. -- Officials are looking for the person who exploded a pipe bomb at a school bus stop in Calaveras County.
The bomb went off Monday just after midnight.
A school bus stop at the corner of Highway 4 and Lilac Drive was damaged by the blast.
Nobody was hurt.
Neighbors said they heard the explosion, but did not see anything suspicious before the explosion.
Evidence collected at the scene will be sent to the Department of Justice.
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