Philadelphia firefighters work on burned row homes on Saturday, July 5, 2014, in Philadelphia. (AP Photo/Michael Perez) ((AP Photo/Michael Perez))
Philadelphia firefighters working on burned row homes on Saturday, July 5, 2014, in Philadelphia. ((AP Photo/Michael Perez))
Philadelphia firefighters work on burned row homes on Saturday, July 5, 2014, in Philadelphia. ((AP Photo/Michael Perez))
Philadelphia firefighters watch as a front wall collapses from a burned row home on Saturday, July 5, 2014, in Philadelphia. ((AP Photo/Michael Perez))
Philadelphia firefighters walk past burned row homes on Saturday, July 5, 2014, in Philadelphia after a fast-moving row house fire early Saturday left four children dead. ((AP Photo/Michael Perez))
Four children were killed when a 3-alarm fire broke out in Southwest Philadelphia.