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PHILADELPHIA (CBS) – The FBI is teaming up with police in Philadelphia and Cheltenham Township to find two people behind a series of robberies.

Detectives believe the pair has robbed nine businesses in the past month, including a Rite Aid Pharmacy that was hit twice.

Investigators released these photos of both suspects seen wearing black hooded sweatshirts.

Credit: cbs3

credit: cbs3

Former President Obama Campaigning For Sen. Casey In Philly 

If you know anything about the robberies, call the FBI or Philadelphia Police Violent Crimes Task Force at 215-418-4000.

There is a reward for information leading to an arrest.