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Rescue personnel from the Tonkawa Fire Department extricate a woman pinned in vehicle after it was involved in an accident on Interstate 35 near Blackwell, Okla., Thursday, Oct. 18, 2012 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.

October 19, 2012

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.