Officials Investigating Cause of Electrical Arc in Houston

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HOUSTON Five utility workers remain hospitalized with burns amid the investigation into what caused an electric arc and flash fire in a downtown Houston building.

A CenterPoint Energy spokeswoman says one worker was in critical condition Friday while the other four are stable. Alicia Dixon also says crews worked to restore full power to the Southwestern Bell building following Thursday's incident.

Dixon says the accident happened as crews were doing routine maintenance on a vault, which stores equipment to serve underground power lines.

Emergency officials originally said the incident occurred in the building's basement. The Houston Fire Department later indicated the vault is in an enclosed area beneath a sidewalk next to the building.

CenterPoint Energy, fire department officials and the Occupational Safety and Health Administration are investigating.