Police say a Delaware couple reported they were driving home Wednesday night when a man suddenly sat up in their back seat and demanded they pull over.
A Delaware State Police statement said the 74-year-old driver and her 78-year-old husband didn't know when, how or where he got into their vehicle.
The couple said the man grabbed the husband and threatened to cut him with a knife if he didn't hand over cash. They say the man grabbed the woman's purse and a brief struggle ensued. The woman accelerated toward a nearby home and the couple jumped out of the car. Then they realized the back seat was empty.
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The driver and her husband weren't physically harmed. The troopers say they are continuing to investigate the robbery.