MANCHESTER — City police are investigating the cause of a crash that killed a male motorcyclist on Brown Avenue Tuesday afternoon, officials said.

The name of the victim, a 26-year-old Manchester man, was not released pending notification by police officials of his next of kin.

Manchester police, fire and American Medical Response officers first answered a call at 4:43 p.m. Tuesday for a “serious motorcycle accident” near the intersection of Brown Avenue and Airport Road.

Manchester Traffic Sgt. Richard Brown said the cause of the crash is unknown. The southbound lane of Brown Avenue from Airport Road to Devon Street was closed for several hours at rush hour into the night.

Police officials urged drivers to avoid this area and warned there would be traffic delays for hours.

Witnesses on social media said they saw a single motorcyclist leave the roadway and crash.

The victim had been riding what witnesses described as a “silver and black” or “white and black” so-called sports bikes.

Sgt. Brown said this is “motorcycle season,” urged car and truck drivers to be alert for them and said the city can have a half dozen accidents in a typical week. Anyone with information about the crash is urged to contact the Manchester Police Dept. at 668-8711.