While en route from Raleigh/Durham, NC to Newark, NJ, the crew reported the right hand engine was on fire and diverted to Philadelphia for an emergency landing. They evacuated on the runway while ARF sprayed down the right engine. No injuries reported.
Found the tower Comms but can't find anything for approach or other ATC. File is from KPHL Tower west 4/28/2015 19:30-20:00Z. 4882 checks in at the 26:00 minute mark.