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PHOENIX, Ariz. — Police are searching for a gunman who shot 3 people at a Phoenix office building, killing one and wounding 2 others.

The gunman, identified as Arthur Harmon, 70, was last seen driving away from the scene in a white Kia Optima police say.

His current whereabouts are unknown. Police have not yet put out his photo.

Harmon’s wife is reportedly cooperating with the investigation.

office-shootingThe incident was reported at about 10:30 a.m. (12:30 p.m. ET) near the intersection of 16th Street and Glendale, said Sgt. Tommy Thompson, a public information officer with the Phoenix Police Department.

Thompson said he did not believe the shootings were random.

“We believe that this individual was probably known to the victims,” he said. “We believe that this individual came to this location, for whatever purpose, got into an argument, which turned into gunfire.”

Attorney Mark Hummels was identified by his law firm, Osborn Maledon, as one of the victims.

He was involved in a client mediation when he was shot, the Phoenix firm said.

The building houses several medical-related businesses, Public Information Officer James Holmes said. He said witnesses described the suspect as a man in his mid-60s who fled in a white vehicle.

Former astronaut Mark Kelly referred to the shooting during a Senate Judiciary Committee hearing in Washington on gun violence. “There’s 50 or so police cars on the scene,” he said.

Kelly and his wife, former Rep. Gabrielle Giffords, D-Arizona, this month launched “Americans for Responsible Solutions,” which seeks to raise money to counter the influence of the gun lobby.

Two years ago, Giffords was shot in the head by a gunman in a parking lot in Tucson.