A dust storm closed a 14-mile stretch of a state highway in the Casa Grande area for nearly three hours after multiple car accidents. Authorities say most of the crashes are fender benders and no serious injuries were immediately reported Thursday. Arizona Department of Transportation officials say low visibility and the crashes forced the closure of State Route 347 from Interstate-Ten to Casa Blanca Road. The closure was about five miles north of Maricopa. Gusty winds in the area dropped visibility to about a mile.