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The charred remains of two cars are left on Monday, May 5, 2014, in Guthrie, Okla., the day after a wildfire tore through the area. Firefighters worked through the night and into early Monday to battle the large wildfire that destroyed at least six homes and left at least one person dead after a controlled burn spread out of control in central Oklahoma. (AP Photo/Nick Oxford)

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In this Saturday, March 1, 2014 photo, William Saum stands near his front porch in Clarksburg, W. Va. In March 2013, a truck carrying drilling water overturned onto a car carrying his wife and two young sons. Both children, 7-year-old Nicholas Mazzei-Saum and 8-year-old Alexander, were killed. An analysis of traffic fatalities in the busiest new oil and gas-producing counties in the U.S. shows a sharp rise in deaths that experts say is related to the drilling boom. (AP Photo/Keith Srakocic)

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Pakistani girl Amina shows her thumb being marked after receiving polio vaccine in Lahore, Pakistan, Monday, May 5, 2014. For the first time ever, the World Health Organization on Monday declared the spread of polio an international public health emergency that could grow in the next few months and unravel the nearly three-decade effort to eradicate the crippling disease. (AP Photo/K.M. Chaudary)

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A Pakistani health worker gives a child a polio vaccine in Lahore, Pakistan, Monday, May 5, 2014. For the first time, the World Health Organization on Monday declared the spread of polio an international public health emergency that could grow in the next few months and unravel the nearly three-decade effort to eradicate the crippling disease. (AP Photo/K.M. Chaudary)

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Gold bars recovered from the wreck of the S.S. Central America off the South Carolina coast are seen in this April 15, 2014 photograph provided by Odyssey Marine Exploration Inc. Odyssey announced on Monday, May 5, 2014, that the bars are among nearly 1,000 ounces of gold that has been initially recovered from the wreck of the ship that sank during a hurricane in 1857. An earlier expedition a quarter-century ago recovered gold bars and coins worth about $50 million at that time. (AP Photo/Courtesy Odyssey Marine Exploration Inc.)

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Five gold bars recovered from the wreck of the S.S. Central America off the South Carolina coast are seen in this April 15, 2014, photograph provided by Odyssey Marine Exploration Inc. Odyssey announced on Monday, May 5, 2014, that the bars are among nearly 1,000 ounces of gold that has been initially recovered from the wreck of the ship that sank during a hurricane in 1857. An earlier expedition a quarter-century ago recovered gold bars and coins worth about $50 million at that time. (AP Photo/Courtesy Odyssey Marine Exploration Inc.)