Flames ravaged the synagogue, known as The Beach Shul, located in a home at 206 Seagirt Avenue in Lawrence.
It happened just after 12:30 a.m. Thursday.
Firefighters battled frozen hydrants and cold conditions. The fire was extinguished in about an hour.
Members of the Rockaway Nassau Safety Patrol posted pictures of the Torah scrolls they saved from the fire.
Two firefighters were treated for minor neck and shoulder injuries at Mount Sinai South Nassau in Oceanside.
The fire did not spread to an adjacent building, as previously reported.
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