MECHANIC FALLS, Maine - The Halloween season got off to a tragic start when a vehicle carrying people on a "haunted hayride" here veered off a steep cliff, killing a 17-year-old girl and injuring 22 others, two of them critically, and another teen working at a "zombie" attraction was run over at a similar attraction in Idaho.

Sky News reported that the tractor pulling a wagon with people on board on Saturday night on "The Gauntlet Haunted Night Ride" struck a tree after it "jack-knifed" and struck a tree, after going off a dirt rode on a farm in Mechanic Falls, Maine.

Air ambulances flew injured passengers to hospital, the station reported, noting that a teenaged boy and the attraction's driver remained in critical condition.

Posts made by relatives of the injured on the farm's on the farm's Facebook page shortly after the accident described a "terrible accident" that required ten ambulances as well as the Life Flight planes.

Sky News quoted Guy Desjardins, the sheriff of Androscoggin County, telling reporters: "The trailer jack-knifed and the jeep went off the road. We're talking about a very narrow dirt road, but extremely steep. I've never witnessed a single incident that resulted in so many injuries."

In a another accident in Idaho, also on Saturday night, Sky News reported that an 18-year-old who worked as a walking dead creature on the Zombie Slayer Bus Ride fell and was reportedly killed instantly when the rear wheel of the bus ran over him.

Riders use paintball guns to shoot the live actors dressed in ghoulish make-up along the route.

Sky News reports that officials at the ride issued a statement that said: "Many of the patrons believed it was just part of the ride. It was not until the bus had travelled away from the victim's location, and the role players began to reset for the next bus to come along, that anyone realised something was wrong."