Right after the gunfire at about 10:30 P.M., dozens of officers swarmed the 2900 block of North Rinnggold Street.
Police ran after the man through the streets of North Philadelphia and at least one shot was fired at the suspect.
There's no word on whether the suspect was hit.
He escaped capture during the chase and remains on the loose.
None of the officers was hurt.
There's no word yet on the nature of the robbery.