There, police say, the man entered the branch and pointed a black hand gun at the teller.
He demanded money be placed in a plastic bag that he had brought with him.
A red dye pack had been placed in the bag, and went off once he left the bank.
For that reason, police say the man may have red stains on his clothing or skin.
The man fled on foot.
Anyone with any information about this robbery is asked to call Tredyffrin Township Police at 610-408-3647.
You can get the latest crime statistics from the Philadelphia Police by CLICKING HERE for the force's crime data mapping site.
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