It happened at about 12:30 a.m. at the intersection of Oak Street and Belmont Court in Amityville.
The driver of a BMW, 27-year-old Alex Demetrius, of Nesconset, was driving eastbound on Oak Street when he entered the westbound lane and struck a Toyota Corolla traveling westbound.
The driver of the Toyota, 65-year-old Joseph Cloonan, of Staten Island, his son and only passenger, 34-year-old John Cloonan, of Staten Island, and Demetrius were all pronounced dead at the scene.
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Kirk Urson, a neighbor, said drivers are constantly speeding down the road, well above the 30-miles-per-hour speed limit.
"People come down through here and they're flying, and you can hear them all the way down through," he said.
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Police continued to investigate the scene. There was no word about any possible charges.
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