As many as 100 bikers surrounded the Hells Angels clubhouse in Hempstead Village on Sunday, ready for a clash, but left after police showed up in force, authorities said Monday about an incident that remains under investigation.

A group called the Unknown Bikers motorcycle club came “in force to retrieve vests” — clothing with colors or emblems that represent the group — after they were taken by Hells Angels on Friday night, according to an initial gang intelligence report by the Nassau County police special investigations squad, which was at the scene and is investigating.

The Unknown Bikers club is based in Brooklyn and has as its emblem a skull inside a red, horned helmet.

Hempstead Village police and about 50 Nassau officers from four precincts converged about 3:30 p.m. at the Hells Angels motorcycle club quarters on Henry Street, authorities said. Photos of the scene showed Nassau SWAT officers wearing bullet-resistant vests and carrying rifles as they walked on the roadway toward the motorcycle club.

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The officers put themselves between the two motorcycle clubs, and the 80 to 100 Unknown Bikers eventually left, according to the report.

“Upon arrival of officers, bikers dispersed without incident,” said Det. Vincent Garcia, a Nassau police spokesman. “There was no fight, no injuries and officers remained until the bikers left.”

Hempstead police Monday night declined to comment.