A single-car crash in St. Louis County early Saturday killed two and sent one to the hospital.

The crash happened at 2:45 a.m. on a curve near the 11500 block of County Road 8, about 45 miles west of Duluth near Floodwood.

The St. Louis County Sheriff's Office said deputies received an automated 911 call from an iPhone. They found the 23-year-old driver alive and two 23-year-old passengers who were pronounced dead at the scene.

The Sheriff's Office on Sunday identified the two killed as Madison Joy Warren of Oakdale and Joseph David Trowbridge of Woodbury.

The 23-year-old driver Darren Andrew Tenney of New Richmond, Wis., was trapped in the vehicle and airlifted to the hospital, where he was in stable condition on Saturday.

The crash is under investigation, but speed and alcohol appear to be contributing factors, the Sheriff's Office said.