Someone is shooting at cars along an Arizona highway.
Officials are investigating four separate shootings over three days along I-10. It was not immediately clear if the incidents were related.
Multiple rounds were fired in all of the incidents, according to NBC station KPNX. Investigators believe the shooter was also in a vehicle traveling on I-10, KPNX reported.
The shooting occurred on Saturday just after 11 a.m. local time when a sport utility vehicle was fired upon and struck, according to a statement from the Arizona Department of Public Safety. A teen girl riding in the passenger seat was treated on the scene for a cut to her right ear.
Minutes later, according to officials, a bus traveling in the opposite direction was hit by a bullet. There were no injuries.
Bus driver Robert McDonald told KPNX that he heard a loud bang while driving but assumed he'd hit something and didn't think much of it. When he stopped for a Coke, McDonald saw a bullet hole on the front of his tour bus.
"I almost fainted," he said. "The wind got knocked out of me."
The third shooting was later that night. The department of public safety said a driver told detectives she heard a "loud banging sound" but did not check her vehicle until the following day, at which point she "noticed bullet holes" on the passenger side.
Early Monday, a bullet hit a work truck en route to a work site.