A 20-year-old man was shot and killed Saturday afternoon as he allegedly attempted a carjacking in an East Germantown parking lot, police said.

The incident began shortly before 1 p.m. when the 20-year-old approached an older man in the CVS lot on the 6300 block of Stenton Avenue. Police said the younger man attempted to rob the older man of his items and steal his car. A struggle ensued. The older man yelled for help and caught the attention of a nearby security company supervisor.

The security supervisor drew a weapon and shot the younger man three times. Responding police officers took the man to Albert Einstein Medical Center, where he was pronounced dead. An investigation is continuing. No charges have been filed.

It was the second fatal shooting to occur Saturday in Philadelphia. The first happened just after 2 a.m. at a Chinese takeout restaurant in Olney, where a 19-year-old was killed.

Staff writer Sam Wood contributed to this report.