Скачать или смотреть Ken Block: Snowmobile Accident Details

6:59 PM PT -- According to the Wasatch County Sheriff's Office, Ken Block was riding a snowmobile at around 2 PM on a steep slope when the vehicle suddenly upended and landed on top of him.

Officials say he was pronounced dead on scene due to injuries he suffered during the accident.

Mr. Block was riding with a group but was alone when the accident occurred," the sheriff's office said in a statement. "We are saddened to hear of the loss of Kenneth and our hearts are with his family and friends so deeply affected."

Details surrounding the accident are not yet clear. Block's team, Hoonigan, released a statement on the tragedy ... saying, "Ken was a visionary, a pioneer and an icon. And most importantly, a father and husband."

"He will be incredibly missed."

Block was in Utah snowmobiling ... and posted pictures on Instagram earlier Monday morning.