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CASA GRANDE, Ariz. (AP) - Dust storms have hampered travel in south-central Arizona, and the state Department of Public Safety is warning travelers to avoid Interstate 10 near Casa Grande until the dust settles.

Public Safety spokesman Harold Sanders says visibility along the interstate from mile post 190 to 216 is poor to zero.

Sanders says officers are investigating numerous collisions in the area that resulted from Saturday's dust storms. He had no details on any of the collisions.