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PHILADELPHIA (CBS) — Police and the FBI are trying to find a serial bank robber who just struck for the third time in nine days.

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A surveillance picture of the suspect shows him robbing the Citizens Bank branch on South Easton Road in Glenside Tuesday morning.

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Detectives think the same man also robbed the PNC bank on North Broad Street last Monday and Santander Bank on South Easton Road in Wyncote last Wednesday.

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Police say he should be considered armed and dangerous.