Officials are investigating four separate shootings at cars over three days along I-10 in Arizona, NBC News reported. 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. The third shooting was later that night and on Monday a bullet hit a work truck en route to a work site.