SOMERVILLE (CBS) – A Saturday morning bank robbery has local and federal investigators on a man hunt.

An unidentified suspect robbed the Union Square branch of Citizens Bank in Somerville. He passed a note to the teller demanding cash and claiming he had a gun.

The teller complied and the suspect escaped out the back exit.

Somerville police and the FBI Violent Crimes Task Force are looking for a white male in his late 30s or early 40s. He is described as between 5-foot-6 and 5-foot-8, medium build, with short brown hair. He was wearing a black and white striped Adidas jacket and had sunglasses hanging from his shirt. He was also wearing jeans and white sneakers.

Anyone with information is asked to contact Somerville Police at 617 625-1212 or the FBI at 617 742-5533.