A small medical jet carrying six people crashed in a Northeast Philadelphia neighborhood Friday evening, officials said, causing an explosion and setting several homes ablaze. It's unclear if anyone aboard survived.

Officials said they could not yet confirm how many people may have died on the ground after the plane slammed into a heavily populated portion of the city.

A medical transport plane with a child patient and five others aboard crashed into a Philadelphia neighborhood shortly after takeoff Friday evening, exploding in a fireball that engulfed several homes and strewed debris. See photos below of the aftermath.