Authorities Investigate 10th Incident on Arizona Highway

Police say a rear window was shattered by what appears to be a BB gun, the 10th possible shooting in 12 days.
2:12 | 09/10/15

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Transcript for Authorities Investigate 10th Incident on Arizona Highway
But those scary attacks on drivers in Phoenix. Police suspect a serial shooter. Take a look, ten incidents in all. ABC's kayna Whitworth is on the scene in Phoenix. Good morning, kayna. Reporter: George, good morning to you. So imagine what it's like for commuters here. They're buckling in for a 12th day where they're asked to remain highly vigilant on this busy stretch of I-10. Authorities asking them to pay attention for anything suspicious on the side of the road and even other drivers. They haven't ruled out the fact that the shooting could be coming from a moving vehicle. This morning, authorities investigating yet another shooting along one of Arizona's most heavily traveled freeways. Police say the rear window of this truck was shattered Wednesday afternoon in broad daylight by what the driver believes may have been a bb gun. Authorities linking this to a surge of shootings all along this highway, now ten reported incidents in the last 12 days. I'm a big target. It does kind of concern me a little bit. Reporter: Every shooting happening along this short eight-mile stretch of road, cars hit on both the east and westbound lanes at all hours of the day. One incident damaging a tour bus. In mother shooting a 13-year-old girl was injured. These are bad people trying to do harm to good people. Reporter: Police desperately trying to figure out who is responsible. Do you guys have the manpower morning. Y? A dium hotoffee, creaand two Gase? Medium hotoffee, cam, two sugars- soundsood. At dkin', weak youroffee just the W you likit. Otifwe'l nt mal again I tonhepot. Yotomorrow that'she dd coitment. Ica er on nsduin'. That is alarming. Thanks to kayna for that. Breaking news overseas. Epic flooding in Japan threatening the Fukushima power

This transcript has been automatically generated and may not be 100% accurate.

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