A man died and a woman was seriously injured in a snowmobile crash early Sunday in Isanti County.

Deputies from the Isanti County Sheriff's Office responded at 12:50 a.m. to a report of a single-vehicle snowmobile crash in the 2500 block of Paradise Trail NW., according to a news release. The crash occurred near Lake Francis, west of the city of Isanti.

The man was pronounced dead at the scene and the woman passenger was transported to Mercy Hospital in Coon Rapids, where she remained in critical condition Sunday morning, according to Capt. John Elder.

The Isanti Fire District and Police Department assisted at the scene.

Preliminary information indicated that the pair rode the snowmobile briefly onto Lake Francis, then struck a tree when leaving the lake.

The crash remained under investigation Sunday by the Sheriff's Office, which will determine whether speed or alcohol played a role in the crash, Elder said.