PHOENIX - Authorities say a gunman opened fire at the end of a mediation session at a Phoenix office complex on Wednesday, killing one person and wounding two others.

Authorities identified the suspect as Arthur D. Harmon, who is at large and described by police as "armed and dangerous."

They identified a man who died hours after the Wednesday morning shooting as 48-year-old Steve Singer.

Police didn't release the names of those injured, but a Phoenix law firm, Osborn Maledon, said one of its lawyers, Mark Hummels, was among the wounded. The firm said he "was representing a client in a mediation" when he was shot.

According to court documents, Harmon was scheduled to go to a law office in the same building where the shooting took place for a settlement conference in a lawsuit he filed last April against Scottsdale-based Fusion Contact Centers LLC.

The company had hired him to refurbish office cubicles at two call centers in California, but a contract dispute arose.