CHICAGO (CBS) – The FBI is offering a $1,000 reward for information leading to the arrest and conviction of a man who robbed a bank in the Loop Monday morning. Authorities responded to the Citibank just before 10 a.m. in the 100 block of North Michigan Avenue. The suspect walked in, displayed a demand note, and implied that he had a handgun.

Authorities in Chicago seek the public’s help in identifying a suspect linked to the robbery of a Loop-area bank. The robbery occurred on Monday, Sept. 16, just before 9:50 a.m. at Citibank in the 100 block of N.

A man thought to be in his 30s took an undisclosed amount of money from a Loop bank on Monday, authorities said.