A man walked into a Citibank branch Wednesday afternoon and robbed the bank before fleeing on Michigan Avenue, the FBI said.

The robbery happened shortly before 12:30 p.m. at a bank located at 100 S. Michigan Ave. The robber threatened a weapon, according to preliminary reports.

The robber was described as black, about 27-years-old and 5 feet 9 inches tall with a thin mustache. He was carrying a messenger bag with a white over-the-shoulder strap, the FBI said.

The man fled south on Michigan Avenue.

Anyone with information about the robbery should call the FBI Chicago office at 312-421-6700.

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