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Brynn Anderson, Associated Press
A UPS warehouse is surrounded by police tape after a shooting Tuesday, Sept. 23, 2014, in Birmingham, Ala. A UPS employee opened fire Tuesday morning inside one of the company's warehouses in Alabama, killing two people before taking his own life, police said.

BIRMINGHAM, Ala. — The man who killed two people and himself inside a UPS warehouse in Alabama had been fired from the company just a day earlier and one victim had been a supervisor at the facility, police said Tuesday.

Neither the gunman nor his two victims have been named, and Lt. Sean Edwards said police were still trying to reach their families.

The gunman was wearing a UPS uniform when he opened fire Tuesday morning either in or near some offices inside the warehouse in an industrial area just north of the Birmingham airport, Birmingham Police Chief A.C. Roper told reporters.

The sand-colored building sits on a hill and has UPS logos on the front and side. It has a parking lot surrounded by barbed wire.

The gunman had apparently shot himself by the time officers got inside the warehouse, Roper said.

No one else was hurt, Roper said.

"When these people came here to work, they had no idea this would be their last day on earth," Roper said.

Atlanta-based UPS said in a brief statement that the shooting happened around 9:40 a.m. CDT. The company added that it is fully cooperating with the investigation.

Employees who were at the warehouse when the shooting happened were being taken to another location so that they could be interviewed by investigators and provided with counseling, Roper said.

Late Tuesday morning, a long line of police cars with their lights flashing left the area as part of a motorcade with a white school bus. Also, a wrecker with a police escort left the scene towing a dark red Honda SUV.

Vonderrick Rogers lives on the same street as the UPS facility and said he drove past the building shortly after it happened. There were already 10 to 15 police officers on the scene with more arriving, he said.

"Cops were jittering and running around like they were ready to go grab somebody," he said.