A convicted bank robber on federal probation was arrested early Tuesday and identified as the person who allegedly robbed the Union Square branch of Citizens Bank in Somerville Saturday and as the bandit who allegedly smashed his way inside a Westwood gas station to steal cigarettes and lottery tickets Oct. 4, according to court records and officials.

Michael F. Tucker, 45, was arrested by US marshals and ­local police at a Red Roof Inn in Salem, N.H., said Somerville police and the FBI. He was identified as the suspect in the bank robbery by Westwood ­police detectives who were inves­tigating the smash-and-grab at the Shell gas station on Route 1.