Philadelphia Police are searching for a bank robber after the second incident in four days at the TD Bank Branch at 5501 Ridge Ave.

Police Spokeswoman Officer Christine O'Brien said a man walked into the bank branch just after noon on Sunday. He gave the teller a note demanding money, O'Brien said. According to O'Brien, he fled north on Ridge Avenue with $400 in cash. (see surveillance photos, right) There are no reports of any injuries and no arrests have been made.

Police are looking for a man wearing a black hat and all-black clothing. Police believe the same man is responsible for at least four incidents this month, including the robbery attempt at the same bank branch on Thursday. The would-be robber in that case fled without any money.

Police say they think the same man is reposponsible for the following robberies: Feb. 14: Sovereign Bank, Bala Cynwyd

Feb. 12: TD Bank, Haverford

Feb. 2: Citizens Bank, Bala Cynwyd The man is considered to be armed and dangerous by the police, who urge anyone with information to call the FBI at 215-418-4000. or the Philadelphia Police Department.