The cause of the wildfires that swept through part of Long Island, New York, over the weekend is believed to have been a resident making s'mores, police said.

Investigators say embers from a backyard fire spread rapidly, fueling blazes that prompted evacuations and an emergency burn ban.

At least four wildfires broke out on New York's Long Island over the weekend, threatening the Hamptons as people on social media shared videos of the flames and smoke billowing into the sky above.