Police in Philadelphia are on the lookout for a man robbing businesses with an Uzi submachine gun.

Police say the gunman has hit at least six businesses in West Philadelphia in less than a week. The assailant threatens employees and patrons and demands cash before fleeing on a bicycle.

Police Lt. John Walker says an Uzi can fire up to 30 shots in less than a minute. Detectives say they're worried that a robbery with such a powerful weapon will turn deadly.

In three of the robberies, the man with the Uzi had an accomplice who displayed a 9 mm handgun.

Walker says the gunmen aren't making off with much money so police expect the robberies to continue.

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