Updated

Alexian Lien, the man who was dragged from his SUV and beaten by a group of motorcyclists following a frightening chase on a Manhattan highway, has filed a legal notice saying he intends to sue New York City over the attack.

Prosecutors say an off-duty police detective was among the bikers who pursued and beat Lien after a confrontation on the West Side Highway.

The September assault was recorded by one biker and later posted on the Internet. Lien was pulled from his SUV and beaten on the street in front of his wife and toddler son.

The New York Post reports that Lien filed a formal "notice of claim" against the city on Dec. 24, accusing the police department of failing to properly train officers.

A spokeswoman for the city's Legal Department said it would defend the claim if it proceeds to a full lawsuit.

Police say the assault occurred during a motorcycle rally and after Lien and a biker bumped on the West Side Highway. They said bikers surrounded the SUV, forcing it to stop. Lien then fled, plowing over biker Edwin Mieses Jr., who suffered broken legs and severe spine injuries.

Prosecutors said last month they would lessen charges against 11 bikers involved in the assault.

The suspects would get a maximum sentence of 15 years if convicted, instead of the 25 they faced when originally charged with first-degree gang assault.

Based on reporting by The Associated Press.

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