That fire led to an explosion that happened just inches away from nearby residents.
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Dashcam video from fire crews shows the massive plume of smoke rising from the trailer in Hanford.
The flames broke out around 7:30 am.
As soon as crews arrived, they say a five-gallon propane tank exploded as witnesses walked nearby.
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No injuries were reported but the propane tank damaged part of a ladder truck.
Investigators still don't know what started the fire or how much damage was done by those flames.