WINDSOR, Maine (AP) — Authorities say the three people found dead in a Jeep in a bog in Windsor over the weekend were apparently overcome by carbon monoxide fumes as the driver tried to accelerate out of the mire.

Officials have identified the victims as 41-year-old Reginald Gay, his wife, 33-year-old Samantha Gay, both of Windsor, and 22-year-old Luke Thompson of China.

The three went four-wheeling and were last seen alive around 7 p.m. Friday. When they didn’t return home as expected, a relative went looking for them and found the vehicle Saturday evening about 300 yards from the road.

Authorities say it appears the vehicle got stuck and exhaust fumes entered the enclosed passenger compartment as Reginald Gay was trying to drive the Jeep out of the bog.