State police are asking for the public's help solving a hit-and-run crash a car and a motorcycle.

The say it happened on I-87 southbound in the town of Greenburgh Saturday night. A passenger car hit a motorcycle at the exit 7A off-ramp, then fled.

The motorcyclist suffered serious leg injuries.

Troopers are asking anyone who witnessed the crash or has information about the vehicle that fled the scene to contact them at 800-842-2233.