UPDATE: 10:58 p.m. 

Medics are evaluating a firefighter with undisclosed injuries. He is in stable condition and will be transported to the hospital.

Pittsburgh Bureau of Fire responded to a residential structure fire in the 400 block of Iberia Street around 9:45 p.m. A second alarm was called at 9:53 p.m.

The fire began in a structure that was reported to be vacant and under construction. A neighboring structure received exposure, but the occupant was able to exit safely.

Firefighters gained control of the fire in about 30 minutes. All residents were accounted for and the Red Cross was not needed to assist.

There were no injuries to firefighters and no transports by medics on scene. 

The Fire Investigation Unit is investigating the cause of the fire.