Editor’s note: This story has been updated with the correct spelling of Dylan Bazzell’s last name.

The pair of teenagers killed in a sledding incident at Copper Mountain Resort on March 19 died of multiple blunt force trauma injuries, according to the records from the Summit County Coroner’s Office.

Drew Fehr, 17, and Dylan Bazzell, 18, both of Fairbury, Illinois, were seniors at Prairie Central High School and teammates on the high school basketball and football teams, the Pontiac Daily Leader had previously reported.

The two died after riding tandem down the halfpipe at Copper Mountain, launching off a large snowbank at the bottom and landing on hard ice, the Summit County Sheriff’s Office said in a news release at the time of the incident.

A witness called 911 immediately and emergency medical services were quick to treat the boys, but they could not be revived and were pronounced dead on scene, according to the Sheriff’s Office.

The Coroner’s Office determined the manner of death to be an accident.