The wildfires began accidentally when someone in Suffolk County tried to light a fire to make s’mores, officials said. They were fully contained by Monday.

The wildfires that burned through more than 600 acres on Long Island probably originated from a backyard fire in Manorville, Suffolk County, police said.

The current "operating theory" is that the fires were sparked accidentally in a backyard near Sunrise Highway, authorities said on Monday.

Wind-driven brush fires that burned on New York’s Long Island over the weekend, injuring two firefighters and sending large smoke plumes into the air, appear to have been started by people making s’mores in their backyard,

An attempt to make s'mores accidentally sparked the massive brush fires that impacted the East End of Long Island, Suffolk County police said Monday.

Four separate weekend brush fires in eastern Suffolk County are believed to have been sparked by embers from a family attempting to make s'mores Saturday morning in their Manorville backyard, Police Commissioner Kevin Catalina said Monday.

Investigators have determined that the brush fires that burned more than 400 acres of Long Island’s Pine Barrens over the weekend were caused by a family’s backyard bonfire while making s’mores. Fire officials say early emergency response helped contain the flames before they spread further.