A 13-year-old boy was killed Saturday night when he was run over by a trolley wagon pulled by a tractor at a haunted hayride event in central Minnesota.

The Stearns County Sheriff’s Office said that Alexander Mick, 13, of Rice, was pronounced dead at the scene in St. Augusta.

At about 7:37 p.m. Saturday, the sheriff’s office received a call reporting an accident at the annual Harvest of Horror Haunted Hayride.

The caller said that a boy had been injured when he was run over by a trolley wagon being pulled by a tractor, according to the sheriff’s office. Staff and bystanders, including an off-duty police officer and an off-duty medic, rendered aid.

A Stearns County deputy and others were at the event and responded, as well.

Lifesaving efforts continued at the scene but were unsuccessful.

The incident remains under investigation by the sheriff’s office.