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.

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'Forever chemicals' in our water ... Latest on the weather ... Trendy Bites: Apple pie ... pizza? Credit: Newsday

Breaking down the governor debate ... Tell the LIRR what you think ... Home prices fell last month ... 'Forever chemicals' in our water

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