Idaho-bound single engine Pilatus PC-12 with 12 people on board crashed on Saturday, shortly after taking off from Chamberlain, about 225 kilometers west of Sioux Falls, authorities said.
Several Midwestern states grapple with swollen rivers and breached or overtopped levees following heavy rain and snowmelt. Three people have died and at least one person is missing as a result of the flooding.
The expansion has faced fierce opposition from environmental groups, American Indian tribes and some landowners.
Researchers say stone tools and broken mastodon bones unearthed in California show humans might have reached the Americas about 130,000 years ago, ten times earlier than previously thought.
One of the strongest earthquakes rattled Oklahoma on Saturday, leading to a declaration of a state of emergency in Pawnee and the immediate closure of 35 wastewater disposal wells.
While Hillary Clinton has pronounced herself as the Democratic nominee for the US presidential race, Bernie Sanders wants the fight to continue.
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