The shooting happened inside Walnut Lane Apartments in the Germantown section of Philadelphia at around 4:30 p.m.
That's where a 55-year-old woman, who was working at the time, was shot in the face.
The victim is in critical but stable condition at a local hospital.
As for the identity of a suspect, police say they 'know who they're looking for.'
An undetermined amount of cash was stolen during the robbery.