Nine people died on Saturday afternoon when an Idaho-bound Pilatus PC-12 crashed shortly after takeoff in South Dakota.
Chamberlain and central south-central South Dakota were under a winter storm warning at the time of the crash.
Peter Knudson with the National Transportation Safety Board says three investigators are stuck Sunday in Sioux Falls, about 140 miles (225 kilometers) east of the crash site in Chamberlain.
The Pilatus PC-12 aircraft had an intended destination of Idaho Falls Regional Airport, Lunsford said.
"The men and women of law enforcement, first responders and medical professionals should be commended in their heroic actions to rescue the victims in extreme weather conditions", she added.
A winter storm warning remains in effect in Brule County until midday Sunday, the National Weather Service said, potentially including blowing snow that "could significantly reduce visibility".
"The FAA and NTSB have been notified and will investigate", Maule said in a Brule County Sheriff's Office news release. He says inclement weather is making travel to the site hard. Local authorities are guarding the wreckage, with federal investigators expected to arrive by Monday. In 2017, EastIdahoNews.com spoke with Kirk Hansen when Kyäni was recognised for partnering with Idahoan in developing and distributing the Potato Pak - a fortified meal with essential nutrients including protein, fatty acids and vitamins.
All people aboard the plane were from Idaho, Maule Rossow told The Washington Post. It reportedly went down in a cornfield south of Chamberlain. The pilot and two children are among the dead.