FOREST HILLS, Queens (WABC) -- New Yorkers who support Zohran Mamdani were celebrating his victory as the city's first Muslim mayor Wednesday night in Downtown Brooklyn, but less than a few hours later in that same borough, antisemitism was rearing its ugly head.

A yeshiva in Gravesend was marked with swastikas splattered in red paint. It's now covered by Israeli flags.

A gate beside a nearby Jewish cemetery was vandalized as well.

"I take the issue of antisemitism incredibly seriously," Mamdani said on Wednesday morning.

But the reality is, there are serious concerns about the track record of the mayor elect in the city's Jewish communities, from Brooklyn to Queens, and to the high-profile synagogues of Manhattan.

"The only thing I care about is keeping Jewish New Yorkers safe. An

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