The 59-year-old driver was not injured.
Police say the incident occurred last Friday in the Bronx.
They say after the cabbie drove the passenger to his destination, the suspect produced a knife, demanded the driver's money and told him to get out of the car.
The driver compiled and the suspect fled.
The cab was found nearby a short time later.
Police ask anyone with information about the incident to call Crime Stoppers at 800 577-TIPS.
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