It happened about 11:45 p.m. Tuesday at the Shell Dash In on Christiana Road. Troopers say a man was putting air in his car's tires when he was approached by a man who demanded money.
The victim tried to stand up, but was pushed to the ground by the man, who then pointed a knife to his throat.
The victim gave the robber cash. The suspect fled in a car driven by another man.
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