Firefighters responded to a house fire overnight in Braddock.
The fire in the 400 block of Fourth Avenue was reported shortly before 1:30 a.m. Friday, an Allegheny County 911 dispatcher said.
The fire went to two alarms, with flames blowing out of the second floor.
The fire was determined to have been an accident caused by a person smoking while using oxygen, according to Matt Brown, chief of Allegheny County Emergency Services.
No injuries were reported.
The fire was under control as of about 4:15 a.m., but crews remained at the scene.
