The boys were target practicing, according to police

After two days of investigating, police have arrested two teens for allegedly shooting vehicles on an Oklahoma highway, PEOPLE confirms.

The teenage boys were discovered after detectives spoke to one of their parents who said he had seen them out shooting the night of the incidents.

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On Feb. 14 and Feb. 15, reports were made of several Wal-Mart tractor-trailers being struck by bullets on Highway 75, a press release by the Tulsa County Sheriff’s Office states.

While they were driving, drivers believed the loud noises were rocks hitting the rigs, which is common, however, upon arrival at their destination, drivers realized it was bullets not rocks that hit them, the press release says.

Authorities began canvassing the area while Wal-Mart asked its drivers to make a detour and not drive on Highway 75, according to authorities.

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On Feb. 16, Tulsa County Detectives interviewed a man who lived near the highway. The man said that his juvenile son and his juvenile friend had been out on the night in question hunting and shooting.

Detectives detained the two juveniles for question, according to the press release.

“Both juveniles confessed to shooting at tractor trailers on Highway 75 both nights,” the release says.

The boys, who remain unidentified, were charged with eight counts of assault with deadly weapons and eight counts of reckless handling of a firearm.

The boys were allegedly purposely shooting the Wal-Mart tractor-trailers, Deputy Justin Green of the Tulsa County Sheriff’s Office tells PEOPLE.