1 dead, 3 injured in violent Friday morning crash in Philadelphia

PHILADELPHIA - One person is dead and three are injured following a violent early morning car crash in Philadelphia's Walnut Hill neighborhood.

Investigators say the crash involved six cars, but only two of them were occupied.

What we know:

First responders were called to the area of Walnut and South 48th street around 4 a.m. for reports of a deadly crash. 

The violent, multi-car crash left a path of destruction, including one car that slammed into the front of a building.

Officials say one person was killed in the crash and three people were taken to Penn Presbyterian Hospital for treatment.

A total of six cars were involved in the crash, but police say only two were occupied.

What we don't know:

Investigators have not said how the crash happened. 

The conditions of the three people taken to the hospital were not released.