Disaster_Accident

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An injured worker is moved toward a waiting ambulance after an explosion was reported at a business in La Habra, Calif., Tuesday, April 29, 2014. Authorities say eight people have been hurt, three critically, in an explosion and fire at a commercial building in south Los Angeles County. (AP Photo/The Orange County Register, Bruce Chambers)

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An injured worker is moved toward a waiting ambulance after an explosion was reported at a business in La Habra, Calif., Tuesday, April 29, 2014. Authorities say eight people have been hurt, three critically, in an explosion and fire at a commercial building in south Los Angeles County. (AP Photo/The Orange County Register, Bruce Chambers)

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A broken blade is seen on a 300-foot wind turbine Tuesday, April 29, 2014, south of Highmore, S.D., where single-engine Piper crashed in foggy weather Sunday evening April 27, 2014, killing the pilot and three cattlemen. A National Transportation Safety Board investigator is trying to determine why the airplane was flying so low when it apparently hit the blade of the wind turbine. The wreckage of the plane will be removed by Wednesday from the site and taken to Colorado. (AP Photo/Capital Journal, Joel Ebert)

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A broken blade is seen on a 300-foot wind turbine Tuesday, April 29, 2014, south of Highmore, S.D., where a single-engine Piper crashed in foggy weather Sunday evening April 27, 2014, killing the pilot and three cattlemen. A National Transportation Safety Board investigator is trying to determine why the airplane was flying so low when it apparently hit the blade of a wind turbine. The wreckage of the aircraft will be removed by Wednesday and taken to Colorado. (AP Photo/Capital Journal, Joel Ebert)

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A section of the broken blade rests below a 300-foot wind turbine Tuesday, April 29, 2014, south of Highmore, S.D., where single-engine Piper crashed in foggy weather Sunday evening April 27, 2014, killing the pilot and three cattlemen. A National Transportation Safety Board investigator is trying to determine why the airplane was flying so low when it apparently hit the blade of the wind turbine. The wreckage will be removed by Wednesday from the site and taken to Colorado. (AP Photo/Capital Journal, Joel Ebert)

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The South Dakota Wind Energy Center is seen Tuesday, April 29, 2014, near Highmore, S.D., where a single-engine Piper crashed in foggy weather Sunday evening after it apparently hit the blade of the one of the wind turbines. The pilot and three cattlemen returning from a sale of live cattle and embryos were killed in the crash. (AP Photo/Capital Journal, Joel Ebert)

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A woman sits on the curb looking at a damaged vehicle after severe weather passed through the area on Tuesday, April 29, 2014 in Tupelo, Miss. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Hunt Mercier)

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Austin Hargrove, left, and Haley Hracke, right, help recover personal items from a friends home that was destroyed by Sunday's tornado, Tuesday, April 29, 2014, in Vilonia, Ark. A dangerous storm system that spawned a chain of deadly tornadoes over three days flattened homes and businesses, forced frightened residents in more than half a dozen states to take cover and left tens of thousands in the dark Tuesday morning. (AP Photo/Eric Gay)