Liberty Mutual Insurance Co. employees were evacuated from the Wilmington Road building yesterday when a computer electric system malfunctioned.

Neshannock Township Fire Chief John DiCola Jr. said he received the call around 5:30 p.m. as an alarm in the computer room. A malfunction in the electric system had caused the room’s extinguishing system to activate.

Although heat had built up, there was no fire, but the computer system was disabled. No injuries were reported, he said.

Liberty’s computer room is secured and has its own extinguishing system, which releases a gas to dissipate the oxygen, DiCola explained.

He said not many employees were working, but the building was evacuated.

“We got them back inside pretty quickly, because it was mighty cold outside,” DiCola said.

The company’s computer technicians were working to correct the system problems this morning, he added.