Twelve people were onboard when the plane went down in rural Brule County en route from Chamberlain to Idaho, Brule County State's Attorney Theresa Maule Rossow said. Among the dead were the pilot and two children, Sioux Fall's KELO-TV reported. At least nine people were killed, including children, and three others are believed to have survived. Maule Rossow said at the time of the crash weather conditions included "strong winds and snow".
Three survivors managed to escape the wreckage and were taken to nearby hospitals.
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'.
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Rossow also said that first responders and medical professionals worked to rescue the victims in "extreme weather conditions".
The FAA and the National Transportation Safety Board are investigating the crash. The cause of the crash has not been determined.
Initial reports indicate that it crashed shortly after take-off from the Chamberlin Municipal Airport with a destination of Idaho Falls. They were prominent businessmen in Idaho Falls who were executives with oil company Conrad & Bischoff, health and wellness company Kyäni and KJ's Super Stores.