Missoula fire crews battled 20-foot flames when a semitruck caught fire in East Missoula Wednesday evening.

The truck was in the parking lot of Ole's truck stop on Highway 200.

Fortunately no one was hurt.  The truck driver came outside just in time to see crews knocking down the blaze, revealing a melted cab.

The driver told officers he has no idea what happened.

A police officer on-scene told NBC Montana that the driver reported he wasn't aware of any engine trouble.  Firefighters will conduct an investigation into the cause of the blaze.