A man flashed a gun at a city councilman in a Queens park last week, according to law-enforcement sources.

The young man was riding a bike through Baisley Pond Park in Jamaica Friday when he approached Councilman Ruben Wills and lifted his sweatshirt to display the weapon before riding off, according to the sources.

The Queens Democrat told police he saw a group of about 20 youngsters go into the park at about 12:15 p.m. and followed them because he thought they looked suspicious.

Cops are searching for the suspect, the sources said.