Michael Winter

USA TODAY

A UPS worker who was fired Monday shot to death two former supervisors Tuesday in Birmingham, Ala., before killing himself, police said.

The shooting occurred about 9:20 a.m. CT in a warehouse close to the offices of the UPS Customer Center near the Birmingham-Shuttlesworth International Airport.

The identifies of the gunman and his victims, both men, were not immediately released. The shooter is believed to be a 45-year-old father from the Argo area.

Birmingham Police Chief A.C. Roper told reporters that the gunman was wearing his uniform when he shot the two men before turning the gun on himself. Police did not immediately identify the weapon used.

Roper said no one else was injured and police did not fire any shots.

Police Lt. Sean Edwards said the shooter had "received his final papers Monday" and "was not expected to return to work because he was no longer employed there." Why he was terminated was not immediately released.

The gunman reportedly was fired within the past month and had just lost his appeal, according to AL.com.

"It is extremely troubling for the city, for the families involved," Roper said. "When they came to work today they had no idea it would be their last day alive on earth. They were just people working at their jobs."

In a brief statement, Atlanta-based UPS said: "We can confirm that two UPS employees and a recently terminated employee are dead. We are not confirming their identities pending notification of their families by authorities."