Pittsburgh Bureau of Fire responded to reports of a two-alarm fire in an apartment building at 2018 De Ruad Street in West Oakland just after 2:20 p.m.

The fire quickly escalated from a two-alarm to a five-alarm fire within an hour. 

Several firefighters battled the blaze in what Pittsburgh Bureau of Fire Chief Darryl Jones described as, "A very stubborn fire in a very large and old building."

Two firefighters were injured while fighting the fire and were transported by EMS to the hospital; one for smoke inhalation, the other with unknown injuries. Both were in stable condition. 

There were 48 apartments in the building, with 74 residents. All of them have been safely accounted for. The Red Cross and the Salvation Army both provided assistance to residents on scene. 

The Red Cross will be helping to direct residents toward temporary shelter and providing help with food and belongings such as clothing and blankets. Port Authority also provided a bus for transportation.

Fire Chief Darryl Jones declared the fire to be under control as of 5:35 p.m. PLI arrived to inspect the integrity of the structure.

The exact cause of the fire is still under investigation by the Fire Investigation Unit , which is made up of investigators from the Pittsburgh Bureau of Fire and detectives from the Pittsburgh Bureau of Police. 

UPDATE 2: On Sunday, August 18, this fire rekindled as a 1-alarm fire. Firefighters were able to put it out in a little over half an hour at 1:30 p.m. They will be monitoring the building closely. 

UPDATE: The firefighters who were injured fighting this fire were treated and released from the hospital.