Investigators say the man searched for his victims at Morris Market on the corner of 15th and Morris streets around 8:30 p.m. on Monday, Nov. 7.
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Surveillance video released by police Wednesday shows the victims walk out of the store and the attacker puts on a mask then follows them.
He repeatedly punches one victim and knocks the second unconscious.
Police say he stole valuables from both victims and took off.
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The suspect was wearing an Amiri shirt with a skeleton and roses on it.
Anyone with information is asked to call police at 215-686-3013/3014.