Arizona Highway Sniper Still on the Loose

Three suspects in a "copycat" incident arrested, but officials say there's been no break in the case.
3:00 | 09/14/15

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Transcript for Arizona Highway Sniper Still on the Loose
We want to turn to Phoenix where a sniper or snipers have drivers living in fear. 11 vehicles targeted around one popular stretch of highway. Cameras monitoring the roads. And several suspects are under arrest, but authorities say the investigation goes on. Here's kayna Whitworth. Reporter: Tonight, four new arrests but no break in the case of the freeway shootings. They admitted to shooting at six pedestrians. We feel that this is probably a copycat. Reporter: Those suspects allegedly hurling rocks and stones. But tonight, police say their chief suspect or suspects using guns, still on the loose. I think there's different people doing different things, at this point, I'm not ruling anything out. Reporter: The first arrest Friday. 19-year-old Oscar de la torre Munoz remains in custody on unrelated charges. He remains a person of interest. Residents here have been terrorized by 11 confirmed shootings in two weeks along this short eight-mile stretch of heavily-traveled I-10. Police believe there could be more than one shooter. Mark spicer, a former british army sniper, says it could just be a matter of time till the real shooter fires again. It's not a professional. So not someone following a plan. Reporter: Football fans heading to the cardinal game today, on edge. Many avoiding the highway. Hopefully whoever this is is caught soon. Lots of people heading to the game. Tonight, police keeping a heavy presence along that corridor.

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

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