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At approximately 7:20 p.m. on Wednesday March 21, 2012, a woman was walking up the northwest stairs of the South Street subway stop when a man allegedly came up from behind and took her purse off her shoulder. Surveillance cameras caught numerous angles of the suspect, including his escape across the concourse. To submit a tip via telephone, dial 215.686.TIPS (8477) or contact South Detectives directly at 215-686-3013. To view the surveillance video visit The Philadelphia Police YouTube Channel or visit http://phillypolice.com/news.