Philadelphia police and the FBI are looking for a man who robbed a bank less than two hours after a failed robbery attempt at another bank.

The FBI says the unidentified man entered a Sovereign Bank branch in South Philadelphia Monday morning, told an employee he had a gun and demanded cash. But the man ran off before getting any money.

About two hours later, the FBI says the same man entered a Wachovia Bank branch in the Juniata Park section of Philadelphia. He threatened a bank employee and ran off with an undisclosed amount of cash.

No arrests were immediately made.