Pharmacy burglar photos released

BUCKS COUNTY, Pa. - November 24, 2011

Investigators believe he is responsible for at least 4 pharmacy robberies in Bensalem, Lower Southampton, and Warminster over the last month.

In each crime, the suspect wears a dark sweatshirt and partial mask. Police say he uses a large knife to force employees to fill the green bag he's holding with prescription pills.

The suspect may also be driving a silver SUV.

If you have any information on the robberies, call authorities.

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