1 in life-threatening condition after boat crash north of Duluth, Minn.

One person suffered life-threatening injuries after a boat crash Saturday night on Dinham Lake in Ellsberg Township, north of Duluth, Minnesota.

Upon arrival, St. Louis county sheriff's deputies discovered that four people were on the boat when it struck a dock and boat lift, injuring several people.

One person was thrown from the boat and rescued by several witnesses on shore, then transported to the hospital with life-threatening injuries.

The cause of the crash remains under investigation, but it is believed that night time operation, speed and alcohol all were factors in the crash.