The incident occurred around 7:00 p.m. Wednesday at the Trumark Financial Federal Credit Union, located at 7306 Castor Avenue.
Police say a man walked into the facility and handed the teller a demand note.
The teller gave the suspect approximately $3,000 cash.
As the suspect ran on Castor towards Bleigh Avenue, a dye pack exploded and the suspect dropped all the money.
The suspect remains at large.