No one was on board when flames engulfed two school buses parked at a depot in Manalapan, according to WABC. 

School buses on fire at a depot in Manalapan
School buses on fire at a depot in Manalapan (Englishtown Police)
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The fire reportedly started with one bus in a parking lot at 118 Millhurst road, then spread to a second. Workers were able to move other vehicles out of the way.

Bus routes in Englishtown and Manalapan were not affected.

Authorities are investigating the cause of the fire.