The U.S. Coast Guard was searching Sunday night for a vessel that may be in distress on the South Shore, officials said.

An unknown boat in the Lindenhurst area requested assistance about 3:36 p.m., but hasn't been heard from since, said Petty Officer 3rd Class Frank Iannazzo-Simmons, a Coast Guard spokesman.

Coast Guard officials from the Fire Island sector dispatched a 25-foot rescue boat and a helicopter to search the area, but nothing had been found by about 6 p.m., Iannazzo-Simmons said. The search continued into the night.

"We are actively engaged in searching," Iannazzo-Simmons said.

Suffolk fire commissioner removed ... Cedar Beach sewage system ... Dino-mite Vintage Credit: Newsday

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Suffolk fire commissioner removed ... Cedar Beach sewage system ... Dino-mite Vintage Credit: Newsday

Trump's big day at RNC ... New pressure on Biden ... LI teacher loses certificate ... What's up on Long Island

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