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The rear of a car sits on top of another following a crash on Interstate 35 on Thursday, Oct. 18, 2012, near Blackwell, Okla. A massive dust storm swirling reddish-brown clouds over northern Oklahoma triggered a multi-vehicle accident, forcing police to shut down the heavily traveled roadway amid near blackout conditions. The highway patrol said the dust storm caused a multi-car accident, and local police said nearly three dozen cars and tractor-trailers were involved. Blackwell Police Chief Fred LeValley said nine people were injured, but there were no fatalities. (AP Photo/The Ponca City News, Rolf Clements) MANDATORY CREDIT

Dust storm shrouds northern Okla.

A massive dust storm swirling reddish-brown clouds over northern Oklahoma

triggered a multi-vehicle accident along a major interstate Oct. 18,

forcing police to shut down part of the heavily traveled roadway amid

near blackout conditions.