Authorities say four people have died and four more have been injured in a van rollover crash on Interstate 70, about 30 miles west of the Colorado border.

Police are investigating whether the van was involved in human smuggling.

They are searching for one person who was in the van, but ran off after the Friday morning crash.

Utah Highway Patrol Sgt. Todd Royce says authorities believe no other vehicles were involved.

Royce says he believes the passengers don't speak English.

He says he doesn't know how old the passengers were, where they were from or who was driving the van.

Emergency crews brought the injured people to St. Mary's Hospital in Grand Junction, Colorado.

Their injuries range from serious to critical.