Disaster_Accident

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A firefighter, left back, looks through rubble after an explosion at a townhouse complex Tuesday, March. 4, 2014, in Ewing, N.J. A hospital says it is receiving at least six patients from the explosion in a suburb of New Jersey's capital city that caused heavy damage. (AP Photo/Mel Evans)

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This photo provided by Nathan Hergert shows a fire burning at a oil and gas drilling site near Greeley, Colo., on Tuesday, March 4, 2014. Static electricity is being blamed for the massive explosion and fire at the oil and gas drilling site north of Greeley that injured two workers. (AP Photo/Nathan Hergert) MANDATORY CREDIT; MAGS OUT

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This photo provided by Nathan Hergert shows a fire burning at a oil and gas drilling site near Greeley, Colo., on Tuesday, March 4, 2014. Static electricity is being blamed for the massive explosion and fire at the oil and gas drilling site north of Greeley that injured two workers. (AP Photo/Nathan Hergert) MANDATORY CREDIT; MAGS OUT

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A police officer walks near the debris after an explosion at a townhouse complex Tuesday, March. 4, 2014, in Ewing, N.J. A hospital says it is receiving at least six patients from the explosion in a suburb of New Jersey's capital city that caused heavy damage. (AP Photo/Mel Evans)

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FILE - In this Nov. 18, 2013 file photo, a man walks through what is left of a neighborhood in Washington, Ill., a day after a tornado ripped through the central Illinois town. Tornado sirens were tested Tuesday, March 4, 2014, in Washington for the first time since since twisters crossed the state in November, killing seven people and destroying hundreds of homes. The tornado that hit Washington had winds that reached up to 190 mph. It was on the ground for more than 46 miles. (AP Photo/Armando Sanchez, File)

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Passengers wait at a United Airlines gate to board a flight at O'Hare International Airport in Chicago. (AP Photo/M. Spencer Green)

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Traffic, stalled on icy eastbound Interstate 40 heading towards Tennessee, approaches a bridge over the Mississippi River in West Memphis, Ark., Tuesday, March 4, 2014. Some motorists on the highway in eastern Arkansas were stranded overnight due to lingering icy conditions from a weekend winter storm. An Arkansas highway department spokesman said Tuesday that traffic can't get moving consistently because of repeated accidents.(AP Photo/Adrian Sainz)

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Trucks were at a standstill along Petro Road as truckers and commuters escaped standstill traffic along Interstate 40 and Interstate 55 after a combination of ice and wrecks Tuesday, March 4, 2014, in West Memphis, Ark. Some motorists on the highway in eastern Arkansas were stranded overnight due to lingering icy conditions from a weekend winter storm. An Arkansas highway department spokesman said Tuesday that traffic can't get moving consistently because of repeated accidents.(AP Photo/The Commercial Appeal, Brad Vest)