The robbery happened at the First American Bank branch at 11821 S. Western Avenue just before 10 a.m. Tuesday morning, according to a U.S. Department of Justice press release issued Thursday.
One of the robbers allegedly stood guard over bank employees and customers from the lobby, while a second robber jumped over the teller counter.
The second robber allegedly took money from an open drawer and forced an employee to open a vault. Authorities say he took an undisclosed amount of cash in a black plastic garbage bag that he brought with him.
The robbers fled the bank and were seen entering a waiting car described as an older model, gray or silver Chevrolet Monte Carlo. Authorities believe there was also a driver involved. At least one witness saw a partial license plate of "K 9947".
A security dye pack taken by a robber apparently activated as the car sped away, and the robbers reportedly started throwing dye-stained cash out of the moving car. The car struck a City of Chicago garbage truck near 116th and Oakley a few moments later. The car was heavily damaged but continued to drive away from the area.
No injuries were reported in the robbery or the crash that followed.
The case is being investigated by the Chicago FBI's Violent Crimes Task Force, which includes FBI special agents, Chicago Police detectives and Cook County Sheriff's Police investigators.
Anyone recognizing the wanted individuals in the flyer released by authorities or having information about the robbery is asked to call the Chicago FBI at 312-421-6700, or any other law enforcement agency.