A bandit warns he has a gun and demands cash in a pair of bank robberies. Now police need your help finding him. NY1's Clodagh McGowan has the story in this Crime Stoppers report.

Police call him the "Monday Bandit"

He's robbed two banks in Midtown in two months, both times, it was a Monday.

"He's telling them that he has a gun and he's looking for US currency," said

Detective Martin Pastor, of the NYPD’s major case squad.

Detective Pastor says the suspect first hit a Madison Avenue Citibank on February 26^th, approaching the teller, threatening he has a gun and demanding the teller turn over cash...

"So far, he hasn't hit a big score but that doesn't mean he's not going to come back," said Pastor.

Two weeks later, he was back at it. This time he tries to rob a Citibank four blocks away on East 42nd Street. He shows the teller a note stating he has a gun and warns the teller not to push any alarms. But the startled bank worker has trouble opening the drawer.

"Here you actually kind of see the teller back off with his hands, put his hands up," said Pastor.

The suspect gets spooked and leaves before the teller can hand over any cash. Detective Pastor calls the second incident aggressive and says he wants to get this suspect off the street before it happens again.

"So I'm thinking escalation could be what? Possibly showing a firearm? We don't want to find that out," said Pastor.

Detective Pastor says that after the stickups, the suspect weaves in and out of other pedestrians on the sidewalk, trying to blend in.

"He's zig-zagging through the streets, he's not staying on an exact block going from beginning to end," said Pastor.

The suspect was captured on surveillance video at a nearby subway station, making his getaway.

But Detective Pastor is confident someone out there will recognize him...

"We're here to serve the public, but the public actually helps us in solving a lot of these crimes,” said Pastor.  “Somebody out there has to know him, maybe can provide some information on who he is."

Anyone with information is asked to call Crime Stoppers at 1-800-577-8477. All calls are anonymous and there is a cash reward for information leading to an arrest and indictment.