A major dust storm along highway 97 in the lower valley on Sunday lead to a multiple car pileup and a closure of the road south of Toppenish. It was reopened last night. State Patrol officials say the crash happened after drivers rear ended each other after being blinded by the dust. Officials say about 5 cars crashed and the injuries were minor. State Department of Transportation officials say the highway closed at about 1 yesterday afternoon from near milepost 56 to milepost 60, south of Toppenish.  southbound traffic was diverted to state roads, but northbound vehicles were routed onto local roads. Highway 97 was reopened last night.