A man killed two co-workers at a medical supply business Tuesday, then fatally shot himself in the head as police closed in, investigators said.

Police Lt. Kurt Boshart described the violence at American HomePatient as a "work-related incident," but gave no further details.

The gunman, identified as Brewer Hoover Jr., 65, of Harrisonburg, died at a hospital. The victims were identified as Gary Gibson, 54, of Harrisonburg, and Bonnie Gump, 54, of Grottoes.

A police commando team responded to the shootings after the gunman barricaded himself in the building about 8 a.m. Tuesday. Police brought in a hostage negotiation team, but when the gunman stopped talking, officers closed in with their weapons drawn and the gunman shot himself in the head, Boshart said.

Two other employees believed to have been inside the retail business managed to get out unharmed before police arrived, Boshart said.

A telephone message left by The Associated Press at American Home Patient was not immediately returned.

Harrisonburg, a city of about 40,000 residents, is off Interstate 81 about 100 miles (160 kilometers) southwest of Washington, D.C.