Can YOU help the FBI nab an "aggressive and dangerous" serial bank robber?

MILWAUKEE (WITI) -- Can YOU help the FBI nab a serial bank robber? He's known for wearing a painter's mask that hides his face, but officials believe someone out there knows who he is. The FBI believes this serial bank robber is aggressive and dangerous.

The FBI Milwaukee Division, the Milwaukee Police Department and the South Milwaukee Police Department say the man is responsible for the following bank robberies:

Officials say all of the banks targeted by this suspect were located inside grocery stores -- but they don't know why.

The suspect is described as a black man, 6’2″ to 6’3″ tall, with a thin build. He was wearing a black hooded sweatshirt, a North Face jacket, gloves — and a white or blue painter’s mask.

In each case, the suspect presented a demand note and climbed, threatened or attempted to climb over the bank’s security glass counter area to access the bank.

In one of the robberies, the suspect displayed a black semi-automatic handgun.