PHOENIX -- Shots have been fired at four vehicles on Interstate 10 in Phoenix since Saturday morning and authorities are trying to determine if the incidents are connected.
"Somebody knows something," Arizona Department of Public Safety Director Frank Milstead said at a news conference Monday. "We're not sure if these shootings are random or related. We don't know what the intent is. It's not known at this point if it's a copy-cat crime."
One person suffered a non-life threatening injury as a result of one of the shootings, according to authorities.
Milstead said his department is appealing to the public for information from anybody who saw anything unusual on the freeway during the periods when the shots were fired.
"You should be concerned. We have some people or person shooting at moving vehicles on I-10," Milstead said. "It has not ended in tragedy, but it could."
Two vehicles were struck in a half-hour span around 11 a.m. Saturday on I-10 between 19th and 59th avenues and a third vehicle was hit on I-10 near 16th Street about 10:15 p.m. Saturday, according to the DPS.
A fourth vehicle was shot at around 4:25 a.m. Monday near 14th Avenue and I-10.
A tour bus and an SUV were two of the vehicles fired upon, but DPS is withholding other specifics so their investigation won't be jeopardized.
The bullets have hit a windshield and a headlight and the rest have been side impacts on the passenger sides of the vehicles, Milstead said.