The accident happened just before 9 p.m. Sunday in the crosswalk of Linden Boulevard at 237th Street in Elmont.
Police say the 65-year-old victim was crossing the street when he was hit by a 2015 Hino flatbed tow truck traveling eastbound.
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The victim's left leg was severed below the knee, and he was transported to a local hospital in critical but stable condition.
Responding officers immediately rendered life-saving aid by applying tourniquets to control the bleeding.
Authorities later arrested 20-year-old Ibrahim Elfiqi, of Queens.
He is charged with leaving the scene of an auto accident with serious injury.
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