Phila. police make first 'flash mob' arrest By Robert Moran Inquirer Staff Writer Philadelphia police yesterday made their first arrest in the beating of a man during a rampage on South Street two weekends ago. Stephen Lyde, 21, was arrested at his residence on the 5400 block of Sansom Street in West Philadelphia at 11:30 a.m., said Capt. Laurence Nodiff, commanding officer of South Detectives. Many of the people who went to South and Broad Streets on the evening of May 30 appear to have been responding to text messages and online social networking sites, creating a type of spontaneous...