The Routt County Coroner’s Office identified the four people who were killed in a plane crash early Friday near Steamboat Springs.

According to the Coroner’s Office, the victims were 47-year-old Aaron Stokes, 21-year-old Jakson Stokes, 21-year-old Colin Stokes and 37-year-old Austin Huskey. Gazette news partner 9News reports that Jakson Stokes was Aaron Stokes’ son, and that Colin Stokes was his nephew.

The Tennessean newspaper in Nashville reported that in 2016 Aaron Stokes founded Shop Fix Academy, according to a statement by the business. Shop Fix Academy is described as a development organization serving 1,500-plus independent auto repair shop owners.

A preliminary report from the National Transportation Safety Board (NTSB) said that the plane, an Epic Aircraft E1000, crashed into mountainous terrain under unknown circumstances near Emerald Mountain at around 12:20 a.m. Friday.

The Federal Aviation Administration and NTSB are investigating.