It happened around 3:20 a.m. Wednesday at the Bear Tire and Auto on Route 30 in Hainesport Township.
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Police say the suspect entered the building and threatened the woman with a crowbar.
After taking her purse and $7 from the cash register, the suspect ran across Route 38 onto the eastbound side.
The victim described the suspect's voice as gravelly.
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Surveillance video shows a mark or scar on the side of the suspect's face, and he appears to be missing his front teeth.
Anyone with information is asked to contact Bordentown Station Detective Craig McCoy at 609-298-1171.