MILWAUKEE (CBS 58) -- Authorities are looking for a suspect in a robbery at a Buffalo Grove, Illinois BMO Bank, who they believe may be on either side of the Wisconsin-Illinois border.

Law enforcement responded to the bank around 3:23 p.m. Thursday, Dec. 28. According to the FBI, the suspect displayed a note and implied having a weapon.

He's described as a white male, 30-40 years old, about 6' tall, 180 pounds, with facial hair and acne scars on his face. He was last seen wearing a long-sleeved, black jacket, baseball cap, dark pants and white sneakers. 

The FBI Chicago and Milwaukee field offices believe due to the bank's proximity to the border, the suspect may live on either side.

Anyone with information can report tips (anonymously, if preferred) at 312-421-6700 or at tips.fbi.gov.