A snowmobile crash in northern Minnesota on Sunday morning left a woman dead and a man hospitalized, authorities said.

It isn’t clear whether the 18-year-old woman or the 21-year-old man was driving Sunday morning about 6:45 a.m. when their snowmobile crashed into a forestry road gate about 7 miles northwest of Orr at Lost River Road and Ash Lake Camp Road, the St. Louis County Sheriff’s Office said.

Authorities pronounced the woman dead at the scene. The man is hospitalized but his condition and injuries aren’t known.

The cause of the crash is being investigated. The victims’ identities haven’t been released.