August 4, 2017 1:39 pm String of Arsons at Center City Apartment Buildings ATF agents and city fire officials are investigating six arson fires in the last four weeks at The Sterling apartments on JFK Boulevard. US & World Videos 2:26 Pro-Palestinian protest and encampment continues at Drexel University 2:44 Mayor Parker announces city workers will return to office full-time in the summer 25:15 WATCH: Mayor Cherelle Parker announces all city workers will return to office full-time this summer 1:55 Penn students graduate amid extra security after an academic year full of unrest 11:16 Another campus protest in Philly: The Lineup