Phoenix office complex shooting: 1 dead, suspect on the loose

PHOENIX - NEW INFORMATION:  Police have found a body matching the suspect in the Phoenix office shooting in a parking lot.

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Police have identified a suspect who shot three people, killing one at a Phoenix, Ariz. office complex Wednesday morning.

Phoenix police told Scripps Station ABC15 the suspect is 70-year-old Arthur Douglas Harmon.

ABC15 first heard reports of the shooting around 10:45 a.m. at the complex off 16th Street north of Glendale Avenue in the lobby of the law firm, DeConcini McDonald Yetwin & Lacy, P.C.

Phoenix police Sgt. Tommy Thompson said Harmon also shot at a vehicle on 16th Street after the shooting when he learned he was being followed. He remains on the loose as of 4:30 p.m.

Thompson identified the victim deceased as 48-year-old Steve Singer.

Local law firm Osborn Maledon also identified one of the people shot as Mark Hummels.

He was representing a client in mediation at the time of the shooting, according to an Osborn Maledon statement.

Based on information from Thompson, Hummels is in extremely critical condition.

The third victim was a 32-year-old woman with non-life threatening injuries, Thompson said.

SEE PHOTOS OF THE SHOOTING SCENE ON ABC15.COM

LAWSUIT MAY BE TIED TO SHOOTING. READ MORE ON ABC15.COM

Around 4 p.m., Phoenix police were seen at the suspect's home near 28th Street and Acoma Drive.

Earlier in the day, Phoenix police Sgt. Steve Martos said a man, who was not identified as the suspect, was in the home but would not let police in.

Police obtained a search warrant and moved in around 4 p.m. Two people were at the home but the suspect was not inside.

Around 2:30 p.m., police were headed to another location in search of the suspect.

Officers were called out to a Phoenix building near Central Avenue and Thomas Road around 1:15 p.m. after reports that a car at the location may be related to the shooting.

Phoenix police shut down the area during the investigation but have since moved on to a new undisclosed location.

The suspect's vehicle has only been described as a white sedan.

Phoenix police Sgt. Tommy Thompson said police believe the suspect went into the office building looking for someone specific and then got into an altercation.

The suspect, only identified as an older white male, then shot the victims and left the building, Thompson said.

Thompson said one of the victims was transported to a hospital in extremely critical condition. The other two victims shot suffered non-life threatening injuries.

He said police do not believe it was a random act.

Two other people police initially identified as "hurt" received treatment related to stress.

Multiple police vehicles and fire trucks were parked in front of the office complex immediately after the shooting.

Police officers and a police dog were seen sifting through the office building's parking lot.

Traffic is blocked on 16th Street from Glendale to Northern avenues.

There was also another scene earlier Wednesday morning at 16th Street and Glenrosa Avenue as police searched for the suspect.

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