Disaster_Accident

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A sluice box containing mercury, used in the filtration process, operates at a gold mine near Nieuw Koffiekamp. The World Wildlife Fund estimates the small-scale mining is responsible for some 20 tons of mercury entering the environment and posing a risk to people through fish consumption. (Associated Press)

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A man walks over a damaged road in Paiapoi, 13 miles south of Christchurch, New Zealand, on Sunday, Sept. 5, 2010. The area was hit on Saturday by a 7.1-magnitude earthquake that smashed buildings, cracked roads, twisted rail lines and ripped a new 11-foot-wide fault line in the earth's surface, officials said Sunday. (AP Photo/Rob Griffith)

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People stand in front of a bus partially covered by a landslide caused by heavy rains on the Pan-American Highway at Tecpan, Guatemala, on Saturday, Sept. 4, 2010. At least 12 passengers were killed and 25 injured, rescue workers said. (AP Photo)

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A young skateboarder takes advantage of a warped road in Paiapoi, 12 miles south of Christchurch, New Zealand, on Sunday, Sept. 5, 2010. The Christchurch area was struck on Saturday by a powerful magnitude-7.1 earthquake that smashed buildings, cracked roads, twisted rail lines and ripped a new 11-foot-wide fault line in the earth's surface, officials said Sunday. (AP Photo/Rob Griffith)

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Smoke rises from the crash site of a UPS Boeing 747 cargo plane in Dubai, United Arab Emirates, on Friday, Sept. 3, 2010. (AP Photo/Kamran Jebreili)

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U.S. Army soldiers secure a road at the scene of a suicide attack in Kandahar, Afghanistan, on Saturday, Sept. 4, 2010. At least three people were killed and 11 wounded in the car-bomb attack on a U.S. Army convoy, according to local hospitals. NATO said there were no injuries to coalition forces or damage to their vehicles. (AP Photo/Allauddin Khan)

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FILE - In a March 10, 2003 file photo,Dr. Thomas Butler leaves the Mahon Federal Building in Lubbock, Texas, after a federal judge sentenced him to 24 months in federal prison, fined $15,000, and ordered to pay $38,000 in restitution after Butler's report of missing plague-causing bacteria caused a bioterrorism scare. A senior law enforcement official said Friday, Sept. 3, 2010 that officials decided to shut down much of Miami International Airport Thursday after a database showed Butler, a scientist with a suspicious item in his luggage, had once been charged with illegally transporting bubonic plague. (AP Photo / Lubbock Avalanche-Journal, Jim Watkins, File)

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A passer-by walks past a store-front window featuring a placard depicting Hurricane Earl, in Chatham, Mass., Friday, Sept. 3, 2010. Some shops in the town have boarded their windows in anticipation of the storm. (AP Photo/Steven Senne)

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People stand outside a building damaged by a 7.4-magnitude earthquake in central Christchurch, New Zealand, early Saturday, Sept. 4, 2010. A powerful 7.4-magnitude earthquake struck much of New Zealand's South Island early Saturday. No tsunami alert was issued and there were no reports of injuries, but looters broke into some damaged shops in Christchurch, police said. (AP Photo/NZPA, David Alexander)

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In this image from video, a car lies under fallen rubble in Christchurch, New Zealand after a powerful 7.4-magnitude earthquake struck much of New Zealand's South Island early Saturday, Sept 4, 2010. No tsunami alert was issued and there were no reports of injuries, but looters broke into some damaged shops in Christchurch, police said. The quake, which hit 19 miles (30 kilometers) west of the southern city of Christchurch, shook a wide area. (AP Photo/ TVNZ)

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Smoke rises from the site of the crash of a UPS cargo plane in Dubai, United Arab Emirates, on Friday, Sept. 3, 2010. (AP Photo/Kamran Jebreili)

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A metal roof is seen on the ground after winds from Hurricane Earl passed through overnight in Nags Head, N.C., Friday, Sept. 3, 2010. (AP Photo/Gerry Broome)

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Pittsburgh Steelers injured safety Troy Polamalu stands on the sidelines during the final minute of the Steelers' 27-3 win over the Carolina Panthers in an NFL football game in Pittsburgh, Thursday, Dec. 23, 2010. (AP Photo/Gene J. Puskar)

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Deanna Arnold feeds chickens on her farm on Thursday, Sept. 2, 2010, near Garrison, Iowa. Arnold, a former worker at Wright County Egg facilities, said she reported problems such as leaking manure and dead chickens to USDA employees, but was ignored. (AP Photo/Charlie Neibergall)