In Phoenix, officials trying to determine who is behind 10 freeway shootings in 12 days

Authorities in Phoenix are investigating a rash of shootings that have taken place over the past 12 days on Interstate 10.

The tenth shooting in less than two weeks was reported Wednesday morning, when the window of a pickup truck driving east on the freeway in Maricopa County was "struck by a projectile," Arizona's Department of Public Safety said. The driver told Phoenix TV station KPNX that investigators said they think the window was likely hit with a BB that shattered a rear window. On Tuesday, the state's director of public safety, Col. Frank Milstead, called the attacks "terrorism," and state trooper Tim Case told KPNX the shootings needed to be "stopped as quickly as we can before there happens to be somebody getting injured or killed."

Investigators say they are not sure if the shootings are all connected, and there is a $20,000 reward offered for information leading to an arrest.

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