Highway Sniper? 11 Incidents in 11 Days Being Investigated in Phoenix

FBI and ATF join investigation, call these shootings acts of domestic terror.
3:00 | 09/10/15

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Transcript for Highway Sniper? 11 Incidents in 11 Days Being Investigated in Phoenix
airport, Newark. The cargo area collapsing. 777. The engine exploding into flames during takeoff. Pilots rushing to bringhe T plane to a halt. The race to get off. One passenger saying like a river of fire. And late reports Y et another shooting. Authorities calling it at N ofac domestic terrorism. Protest in the capitol against the Iran nuclear deal. Thto be concerned? And the big headline from pellet gun. All of those are projectiles. Reporter: The FBI and ATF joining the investigation and the reward raised to $20,000 for any information leading to an arrest. Authorities now calling it an act of domesticti terrorism. These are bad people trying to do harm to good people. Reporter: The incidents happening here along this eight-mile stretch of I-10. It runs right through the heart of Phoenix, so now people have something else to think about. Officials asking people to report anything that might be suspicious. The shootings started August 29th. That 13-year-old girl, injured after the window of the car she was riding in was shattered. This tour bus also hit. The driver, the only one on board. They almost took me away from my family. Reporter: And on Tuesday, the window of a vehicle driven by a police sergeant also breaking. With no pattern of time or days of the week, people in the Phoenix area, seeking refuge from a highway they use every day. Awe authorities say it would be impractical to shut down the highway. They haven't ruled out someone doing this from a moving vehicle.

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

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