Three people are dead and a regional airport has been heavily damaged after powerful winds including a tornado swept across the upper U.S. Midwest.

Three people are dead in North Dakota, and tens of thousands are without power in northern Minnesota and northwestern Wisconsin after powerful winds swept across the upper Midwest Friday and overnight Saturday.

At least three people are dead in rural North Dakota after tornadoes left damage across eastern areas of the state, the Cass County Sheriff’s Office said in a release Saturday.