GRAND FORKS - It's unknown what caused a Frito Lay truck to start on fire at a Grand Forks gas station Wednesday morning.

Acting Battalion Chief Bruce Weymier of the Grand Forks Fire Department said no one was injured and the fire was put out without doing any damage to the station or igniting its fuel supply.

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Fire marshals are investigating the cause of the fire.

Stamart Complex Manager Brandi Christie said initially, one store customer attempted to approach the truck and put the fire out with an extinguisher but was told to stop and was taken inside with all other customers and employees.

Christie said she thought the fuel pumps would be reconnected before the end of the day. The other fuel pumps for cars on the other side of the building were kept on throughout the incident.

"It was pretty much flames engulfing the whole engine up into the cab," Christie said. "Tires were popping. It was ... crazy."

The truck was burned and blackened, and once the fire was put out, firefighters began removing bags of SunChips from the back of it.

The Fire Department, Grand Forks Police Department and Altru Ambulance responded at the scene. Weymier didn't release the name of the driver.

Check back later for an updated version of this story.