A trio of teenagers was arrested in Westbury for robbing a taxi driver at gunpoint early Thursday morning, Nassau police said.

A taxi driver dispatched at about 2:25 a.m. to Cedar Road for a pickup found the three teenagers and another person sitting on a curb, police said. Two of them entered the taxi -- one reached around the driver and grabbed him by the neck and put him in a chokehold, police said.

Another showed a handgun and demanded money from the taxi driver, who told them he didn't have any, police said. Then one of the robbers "reached in and removed the keys from the vehicle," police said.

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All four of the robbers fled on foot -- three were later found walking west on Prospect Avenue and arrested, police said.

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Police said the three -- Quraan Williams, 18, 162 Rhododendron Drive, Westbury; Christopher Clausell, 18, of 156 Amherst Street, Hempstead, and Marlik Petti-Frere, 16, of 166 Pearl Street, Westbury -- are charged with first-and-second-degree robbery. Additionally Williams is charged with seventh-degree criminal possession of a controlled substance and a violation of a probation warrant and Petti-Frere is charged with first degree criminal use of a firearm, second-degree criminal possession of a weapon and fourth-degree possession of stolen property.

They will be arraigned Friday at First District Court in Hempstead. The fourth robber was not apprehended, police said.

Detectives ask anyone with information about this crime to contact Nassau County Crime Stoppers at 800-244-TIPS. All calls will remain anonymous.