The FBI released surveillance pictures of the two armed men who walked into into the branch at 3328 Touhy at around 11:34 a.m. displaying handguns, according to the Skokie Police Department.
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One of the men held a security officer at gunpoint while the other emptied out cash drawers, police said.
They were then seen getting into a white vehicle and leaving eastbound on Touhy.
No one inside the bank was hurt.
Anyone with information can report a tip to the FBI at 312-421-6700 or tips.fbi.gov.