WELLINGTON, Colo. (CBS4)– Southbound lanes of Interstate 25 north of Wellington reopened Friday night after being closed for hours due to a deadly crash. Two people, an adult and a child, were killed in the one-vehicle crash.

(credit: CDOT)

The crash happened at Buckeye Road, about 10 miles south of the Wyoming border about 7 p.m.

Colorado State Patrol told CBS4 on Saturday morning the only one wearing a seat belt was a 1-year-old child. CSP says a 22-year-old man was ejected. He sustained life-threatening injuries.

A 21-year-old woman was also ejected, but died at the scene. Investigators say a 4-year-old boy was ejected and also died at the scene.

Another 4-year-old boy was ejected, but suffered life-threatening injuries. The 1-year-old was in a forward-facing child seat and suffered serious injuries.

CSP says all victims are from Cheyenne, Wyoming. They say the driver was switching lanes when they believe he over-corrected and crashed into the median, hit a concrete barrier and rolled multiple times.

They believe speed was a factor.

There were massive traffic backups for hours on the interstate. All lanes reopened just after 10 p.m.

(credit: CDOT)

CSP did not have information on the relationships between the victims.

Jennifer McRae