It happened at around 12:30 p.m. Tuesday in the 1100 block of Society Hill Boulevard.
Police say it began when a man, wearing a postal service uniform, knocked on the door.
When a resident answered, the man forced his way inside. He was soon joined by three other men, two armed with handguns.
The two people inside at the time were tied up while the suspects ransacked the home, stealing an undetermined amount of cash and jewelry.
The people who were tied up were not injured.
Anyone with information is asked to contact police at 856-488-7833.