All westbound lanes of the Northern State Parkway were shut down Monday night in Nassau County due to a serious accident, State Police said.

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Two vehicles crashed in the Albertson and East Hills area just before 9:30 p.m., by Exit 29 Roslyn Road and the Exit 29A link to the Long Island Expressway, authorities said.

The lanes remained closed just before midnight, state police said. Other details were not immediately available as investigators at the scene gathered information, police said.