EATON, Colo. (CBS4)– Fire crews rushed to put out a fire after a semi truck burst into flames near an oil rig early Friday morning.

Firefighters with Eaton fire rushed to the fire on Weld County Road 72 and 31, located southwest of Eaton about 5:20 a.m. Friday.

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When they arrived they found the semi truck on fire. It was parked next to the oil rig.

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No one was hurt.

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What caused the fire is being investigated.