SUMMIT COUNTY, Colo. — Three people were killed, including a 9-year-old girl, in a fiery semi crash on westbound Interstate 70 in Summit County Sunday morning.

The crash occurred around 5:42 a.m. at milepost 208 and prompted a nearly 12-hour closure of the westbound lanes in the area.

The Colorado State Patrol said the Freightliner Cascadia semi, with a trailer, was traveling westbound on a downhill straightway on I-70 when it veered off the road, for an unknown reason, approaching a right-hand curve.

The driver then reentered the roadway, struck the center barrier, rolled across lanes, and became fully engulfed in flames, according to the CSP.

No other vehicles were involved.

Troopers said all occupants of the semi were pronounced dead at the scene, but the exact number could not b

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