A mechanical failure in the jeep towing a hayride at a theme park in Maine led to a crash that killed a teenage girl and injured nearly two dozen others, according to police.

Seventeen-year-old Cassidy Charette of Oakland, Maine, died at the Pumpkin Land theme park in Mechanic Falls after the hayride reportedly jack-knifed and flipped over.

Local news station WMTW reports that at least two helicopters were called in to Harvest Hill Farm, which runs the autumn-themed park each year.

One witness reported a heavy response from fire and medical personnel:

@WCSH6 Hayride flipped at the Gauntlet Mechanic Falls, 20 ambulances, 2 fire trucks, 10 police cars, and 1 helicopter pic.twitter.com/WelsO56Vfl — Hannah Morrissey (@HannMorrr) October 12, 2014

Investigators returned to the scene Sunday to reconstruct the accident and check if the hayride was mechanically sound, the AP reported.