PHILADELPHIA — The federal Bureau of Alcohol, Tobacco, Firearms and Explosives is helping Philadelphia authorities investigate a rowhome fire that led crews to a dead body.

The identity of the body hasn’t been released.

Authorities say the fire was reported about 10:40 p.m. in the city’s Kensington section. The first floor of the home was burning and one person inside jumped to safety and was taken to Temple University Hospital for resulting injuries. A firefighter also suffered minor injuries.

But the focus of the investigation appears to be the cause of the fire and the body that was found on the second floor of the residence.

ATF agents are typically not called in unless arson is suspected or the fire is believed to involve some other kind of federal crime.