Disaster_Accident

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Former NFL safety Darren Sharper appears in Los Angles Superior Court, where he pleaded not guilty to charges of drugging and raping two women, Thursday, Feb. 20, 2014, in Los Angeles. Sharper's bail has been increased from $200,000 to $1 million. (AP Photo/Los Angeles Times, Bob Chamberlin, Pool)

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A trio of runners brave a winter storm to go for a run Thursday, Feb. 20, 2014, in Mankato. A winter storm moving into the area created slick roads and threatened to put 5 to 8 inches of fresh snow on the ground in the region. (AP Photo/Mankato Free Press, Pat Christman)

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A steady stream of vehicles leaves Northwood, Iowa on Thursday morning, Feb. 20, 2014 following an evacuation due to a chemical fire in a storage-like building that contained fertilizer at Northwood Municipal Airport. Authorities have lifted an evacuation order for residents of the small northern Iowa city . (AP Photo/The Globe-Gazette, Jeff Heinz)

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Jane Ritzert of Kensett, Iowa, pours coffee for evacuees at the at the Kensett Community Center, a former school gymnasium, in Northwood, Iowa, Thursday, Feb. 20, 2014, after a chemical fire at a fertilizer plant forced the evacuation of the town. Sulfuric acid for fertilizer is on fire at a storage facility at the Northwood airport. Northwood has a population of about 2,000 people. (AP Photo/Albert Lea Tribune, Tim Engstrom)

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FILE - This Nov. 6, 2013, file photo, shows a BNSF Railway train hauling crude oil near Wolf Point, Mont. BNSF Railway Co. said Thursday, Feb. 20, 2014, it intends to buy a fleet of 5,000 strengthened tank cars to haul oil and ethanol in a move that would set a higher safety standard for a fleet that's seen multiple major accidents.(AP Photo/Matthew Brown, File)

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This photo provided by the Columbus Police shows an accident involving a police cruiser and a stopped car on Oct. 18, 2013. An Ohio police officer whose cruiser slammed into a stopped car in the middle of an intersection tried to veer away but couldn't avoid the crash that killed six members of a family, and there is no basis to charge him, authorities announced Thursday, Feb. 20, 2014. Investigators concluded that the other driver entered a Columbus-area intersection despite a red light and was struck on the side by an Upper Arlington police cruiser that was responding to a middle-of-the-night robbery call with its lights and sirens activated. The Oct. 18 crash killed the driver, his wife and four of their daughters, and the police officer was seriously hurt. (AP Photo/Columbus Police)

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This photo provided by the Columbus Police shows an accident involving a police cruiser and a stopped car on Oct. 18, 2013. An Ohio police officer whose cruiser slammed into a stopped car in the middle of an intersection tried to veer away but couldn't avoid the crash that killed six members of a family, and there is no basis to charge him, authorities announced Thursday, Feb. 20, 2014. Investigators concluded that the other driver entered a Columbus-area intersection despite a red light and was struck on the side by an Upper Arlington police cruiser that was responding to a middle-of-the-night robbery call with its lights and sirens activated. The Oct. 18 crash killed the driver, his wife and four of their daughters, and the police officer was seriously hurt. (AP Photo/Columbus Police)

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This photo provided by the Columbus Police shows an accident involving a police cruiser and a stopped car on Oct. 18, 2013. An Ohio police officer whose cruiser slammed into a stopped car in the middle of an intersection tried to veer away but couldn't avoid the crash that killed six members of a family, and there is no basis to charge him, authorities announced Thursday, Feb. 20, 2014. Investigators concluded that the other driver entered a Columbus-area intersection despite a red light and was struck on the side by an Upper Arlington police cruiser that was responding to a middle-of-the-night robbery call with its lights and sirens activated. The Oct. 18 crash killed the driver, his wife and four of their daughters, and the police officer was seriously hurt. (AP Photo/Columbus Police)