PENNSBURG, Pa. -- A man killed six people as he weaved across the Philadelphia suburbs in a predawn rampage Monday, authorities said. Bradley William Stone, 35, started at his ex-wife's Harleysville apartment, breaking in through a glass door around 4 a.m., firing multiple rounds and fleeing with their two children, the woman's neighbors said. Stone was believed to be holed up in his home in Pennsburg, but police said late Monday they are uncertain of his whereabouts.