Investigators said the blast at around 12:30 a.m. was strong enough to blow the roof off the truck, the Los Angeles Times reported. They found a propane tank inside and said that was likely to be the source of the explosion.
No injuries were reported, and no significant damage to anything except the truck.
Residents in the area within 100 yards of the blast were asked to either leave or to stay indoors while the truck was examined. The block where it was parked was declared off limits.
"I heard a big loud noise and the dog started barking," Laura Weir, a neighborhood resident, told KNBC-TV. "The next thing I know, I see the helicopters, I see the Fire Department."
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