Two tornadoes that killed six people in North Dakota and New York each had wind speeds topping 100 mph and caused brief but widespread damage as they tore through largely rural areas, officials said.

The severe storms caused significant damage to homes and infrastructure in several parts of eastern North Dakota.

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.