Possible Break in Phoenix Highway Shootings Case

Undercover police detained a mother and son, who is now a person of interest in the string of shooting incidents.
2:03 | 09/12/15

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Transcript for Possible Break in Phoenix Highway Shootings Case
And he's determined to use his voice as a catalyst for change. Thanks. We'll turn to a possible break in the case in Phoenix. This evening, a major development, inside the SUV, a mother and son. We're nity under siege for almost two weeks. Even with round the clock patrols, people taking alternate routes, school bus drivers under orders to avoid highways. You had to do a field trip yesterday and take all side streets. How much longer did that take you than Normal? Probably another half hour to 40 minutes. It's making this whole town in chaos right now. Reporter: A former FBI agent telling us it's likely the shooter lives nearby. The reason they commit these acts is, it is power. It is a power grab and control over others because they feel powerless in their life. Reporter: Tonight, police still telling people here not to let their guard down. All we can say is, keep the tips coming in. Make sure you're doing your best to keep vigilant. Reporter: That mother and son being taken into custody right here at a gas station. There's still caution tape. The clerk says the man being questioned is a regular. And David, behind that shopping center, witnesses say police were staging this scene for at three hours before they moved in. Kayna, thank you.

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

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