Two children among six people killed in US pile-up during dust storm

The side of a camper sits in pieces on Interstate 90 after a fatal pile-up (The Billings Gazette via AP)

Two children are among the six people who were killed in a pile-up after a dust storm caused blackout conditions on Interstate 90 in the US state of Montana.

Montana Highway Patrol Sgt Jay Nelson said investigators so far have found no other factors that contributed to the crash that led to another eight people being taken to hospital.