Boston police arrested a man suspected of trying to rob a Citizens Bank branch at 2343 Washington St. in Roxbury’s Dudley Square Saturday, police said in a blog post.

Marco Willis, 40, of Boston was arrested less than three hours after the attempted robbery, police said.

According to the blog post, a bank manager told police a man entered at about 11:30 a.m. and held up a deposit slip with “No dye pack” written on it. The manager asked the man to wait and activated an alarm. The man left the bank with no money.

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According to the blog, at about 2:14 p.m., an officer saw Willis, who fit the suspect’s description, walking up Lenox Street toward Shawmut Avenue, about a half-mile from the bank. The officer arrested Willis, who was charged with attempted unarmed bank robbery.