10:30AM MONDAY UPDATE: The California Highway Patrol (CHP) Placerville Office and El Dorado County Sheriff’s Office (EDSO) are continuing the investigation into Sunday’s fatal collision in Kyburz. There are no updates on the children’s conditions.

It is believed that speed was a factor in the crash, which caused the Chevy truck to leave the roadway and collide with a tree, where it came to rest on its side. It was a lengthy process to remove the four occupants from the truck.

A CHP spokesperson said the two adults were pronounced deceased at the scene, and the 8- and 11-year-olds suffered serious injuries. They believe all four involved are the parents and their children.

CHP expects more information to be available within the next two days. At this time, no hometown has been released.

1PM UPDATE: CHP is reporting that two adults in the vehicle were killed when it crashed, and children, an 8-year-old boy and an 11-year-old girl, were flown to Renown Medical Center in Reno with major injuries. Getting the kids out of the vehicle was a long process, with over an hour between the two helicopter transports. More information should be released on Monday.

5:50PM UPDATE: CHP has changed the incident report to reflect at least one fatality in the Sunday afternoon crash. CalStar transported one person to Renown Hospital in Reno. No other information is available at this time but expect delays on US50 at Kyburz.

SOUTH LAKE TAHOE, Calif. – The California Highway Patrol (CHP) is on the scene of a single vehicle collision on US50 near Kyburz. There is currently one-way controlled traffic through the area.

The collision was reported on Sunday at 3:11 p.m. when, for unknown reasons, a Chevy Silverado left the roadway and collided with a tree. The vehicle was occupied by one adult and two juveniles, according to the initial incident report. As of 4:26 p.m., emergency responders were still trying to extract one person from the Chevy, which was resting on its side 20 feet off the highway.

Several vehicles pulled over to assist the passengers until first responders could arrive.

Traffic at this time is diverted to a controlled one-lane flow.

This is a developing story.