The footage of the suspect was taken on December 17th at the Chase Bank on Warburton Avenue in Hastings-on-Hudson.
He's seen wearing a camouflage jacket and goggles and waving an assault rifle at the tellers.
He reportedly acted calm as he demanded cash.
Even though the suspect's face was covered, authorities are hoping someone will be able to identify him.
The FBI believes the same suspect robbed other banks in the area.
Agents say the number of bank robberies has gone down, but there was a spike in armed bank robberies last month.