At least six dead after dust storm triggers mass pileup on Interstate 90 in Montana

Weather conditions with zero visibility' believed responsible for crash involving 20 or more vehicles near Hardin, authorities said

At least six people have died after a dust storm fueled by wind gusts topping 60mph caused a pileup on the Interstate 90 freeway in Montana, authorities said.

At least 20 vehicles were involved in the crash on Friday evening. Sgt Jay Nelson of Montana highway patrol said authorities believed weather was the cause.