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PHILADELPHIA (CBS) — Police are searching for a man wanted in a series of knifepoint robberies at several stores in a citywide spree.

Philadelphia police searching for serial robber. (credit: Philadelphia Police Department)

Police say the robbery pattern began on July 21 when the suspect entered a Cricket Wireless store on the 8200 block of Stenton Avenue, rushed the counter while brandishing a knife and demanded all the money from the cash register.

Since that day through Aug. 7, police say the man has robbed up to 12 other locations, including a Dunkin’ Donuts, McDonald’s, two Metro PCS stores and three Little Caesars restaurants.

(credit: Philadelphia Police)

Police say the robberies are relatively quick and last around a minute.

The businesses that have been targeted go from Mount Airy to Mayfair.

The suspect is described as a black male with a medium complexion, around 5-foot-10 to 6 feet tall, wearing a gray hat, black-hooded sweatshirt and using a large kitchen knife.

Police say the suspect is driving a 2009 or 2010 silver Hyundai Sonata with front-end damage and a paper tag.

If you have information about this suspect, all police.