A Shelton man was arrested at his home Thursday morning by Westport and Shelton police, charged with the knifepoint robbery last week of a Citibank branch at 399 Post Road West.

James L. Watson, 44, of Howe Avenue in Shelton, was charged with first-degree robbery and fifth-degree larceny.

The robbery took place about 1 p.m. Dec. 21 when a man entered the bank, which is near the town's border with Norwalk, showed a knife to the teller and handed the teller a note demanding money, police said. He fled on foot, but police believe that he avoided capture that afternoon by driving off in a waiting car.

Pieces of evidence from the incident, including a trenchcoat, baseball hat and the knife, were recovered on Sylvan Road North shortly after the crime was committed, police said.

Police detectives said Thursday they learned that Watson also had visited a Hudson Valley Bank branch at 420 Post Road West shortly before the Citibank heist.

Watson was unable to post $50,000 bond and was held at Westport police headquarters. He was scheduled to be arraigned Friday in Norwalk Superior Court.