Fire crews responded to the first block of Erna Court in Millbourne on Wednesday shortly after 4 p.m.
Police called it in, saying there were three people on the second floor, possibly entrapped, but maybe simply not coming out of the house.
Fire radio traffic showed:
Smoke was showing from the second floor in a middle-of-the-row home when crews arrived. Crews soon confirmed entrapment on the second floor.
Firefighters also pointed out hoarding conditions, and fire in a rear second-floor bedroom.
One of the persons on the second floor came out of the building, and was reported as semiconscious.
Despite the hoarding conditions, personnel darkened the fire within 10 minutes. The reports also included that a search of the house was negative.
The incident was placed under control at 4:30 p.m.
Eventually, EMS on scene was treating three people. It was unclear if those being treated were residents. One firefighter was transported to Lankenau Medical Center. The injuries were not specified.
There was an extensive overhaul. A fire marshal was asked to come to the scene. Board-up was sought for five windows and two doors.
An official account was not yet available Wednesday evening.