TULSA COUNTY, Oklahoma - Five semi-trucks were struck after gunshots were fired across lanes of traffic on Highway 75 Sunday night. Some of the bullets struck drivers side doors and windows.

Now the Tulsa County Sheriff's Office is searching for the shooter.

Someone opened fired on Highway 75, east of Skiatook. 13 bullets hit five vehicles somewhere between 106th Street North and 156th Street North from 8:30 to 11:30 Sunday night.

Tulsa County sheriff's deputies believe the shooter fired from the west side of the highway.

One of the truck drivers noticed four bullet holes on the driver's side of his rig.

Truck driver Brian Beair said, "It's not something you think about day to day because you can't dwell on things like that."

Even without being shot at, Beair said the job can be dangerous.

The drivers of the trucks that were shot told deputies they heard something hit their trucks.

"We get rocks off the road all the time - hit your windshield, sounds like a gunshot," Beair said.

In this case, it didn't just sound like a gunshot.

None of the three tractor-trailer drivers realized their trucks were shot until they reached their destination - the Ochelata Walmart Distribution Center.

A Walmart spokesperson said the company doesn't believe their trucks were targeted because a passenger car and a Swift trucking rig were also hit.

Beair, who also drives for Swift, said the shootings won't drive him off the road in fear.

"You have the general public's safety in your hands, and you gotta be concerned with that, and everything else comes secondary," he said.

Deputies consider the crime assault with a deadly weapon.

Drivers of the vehicles that were hit weren't able to provide information on a suspect; but, investigators have a bullet fragment from the shooter.