Disaster_Accident

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Emergency personnel work the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia. (AP Photo/Joseph Kaczmarek)

Emergency personnel help a passenger at the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia. (AP Photo/Joseph Kaczmarek)

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Emergency personnel work the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia. (AP Photo/Joseph Kaczmarek)

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Emergency personnel help a passenger at the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia. (AP Photo/Joseph Kaczmarek)

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Emergency personnel work the scene of a train wreck, Tuesday, May 12, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia. (AP Photo/Joseph Kaczmarek)

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Emergency personnel work at the scene of an Amtrak train derailment Tuesday night in Philadelphia. (CBS Philadelphia)

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Nepalese people gather in a temporary shelter after another earthquake in Bhaktapur, Nepal, Tuesday, May 12, 2015. A major earthquake has hit Nepal near the Chinese border between the capital of Kathmandu and Mount Everest less than three weeks after the country was devastated by a quake. (AP Photo/Tashi Sherpa)

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Illustration on the need to hold fire on attacking Hillary Clinton by Alexander Hunter/The Washington Times

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A Washington Metro employee directs Metro passengers arriving by bus from Rosslyn, Va. towards the Foggy Bottom Metro Station in Washington, Monday, May 11, 2015, after D.C. Fire and EMS officers say a Metro third rail insulator was damaged, shutting down metro service between Foggy Bottom and Rosslyn. (AP Photo/Andrew Harnik)

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A row of Google self-driving Lexus cars at a Google event outside the Computer History Museum in Mountain View, California, May 13, 2014 file photo shows. (AP Photo/Eric Risberg) ** FILE **

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This May 13, 2014, file photo shows a Google self-driving Lexus at a Google event outside the Computer History Museum in Mountain View, Calif. Of the nearly 50 self-driving cars rolling around California roads and highways, four have gotten into accidents since September 2014. (AP Photo/Eric Risberg, File)

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NASA used rapid prototyping to build its Greased Lightning (GL-10) drone, which has 10 engines and can fly like a helicopter or an plane. (Image: NASA)

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In this July 6, 2011 photo, Facebook COO Sheryl Sandberg, left, and her husband, David Goldberg, CEO of SurveyMonkey, arrive at the Sun Valley Inn for the Allen and Co. Sun Valley Conference, in Sun Valley, Idaho. Goldberg died in an accident while exercising at a Mexican vacation resort on Friday, May 1, 2015. (AP Photo/Julie Jacobson, File)

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In this aerial photo taken Tuesday, April 28, 2015, house boats sit in the receding waters of Lake McClure in Mariposa County Northeast of Merced, Calif. The State Water Resources Control Board is considering sweeping mandatory emergency regulations to protect water supplies as water levels as some of California's lakes and reservoirs continue to decline. (AP Photo/Rich Pedroncelli)

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In this 1889 file photograph, people stand atop houses among ruins after disastrous flooding in Johnstown, Pa. Facts, figures and anecdotes about the Johnstown flood in Pennsylvania, which killed 2,209 people 125 years ago, gave the Red Cross its first international response effort and helped set a precedent for American liability law. (AP Photo/File)

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A D.C. firefighter died at the scene of an apartment fire in the 1300 block of 7th Street. (Twitter: D.C. Fire Fighter L36)

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In this April 16, 2015, file photo, California Gov. Jerry Brown talks with reporters after a meeting about the drought at his Capitol office in Sacramento, Calif. (AP Photo/Rich Pedroncelli, File)

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Members of 72 FDNY are promoted on Sept. 17, 2014. (Image: Facebook, New York City Fire Department) ** FILE **

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Washington Nationals relief pitcher Tanner Roark (57) celebrates a 6-4 win over the Miami Marlins with catcher Wilson Ramos (40) in a baseball game Monday, May 4, 2015, in Washington. (AP Photo/Nick Wass)

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In this May 3, 2015 photo provided by U.S. Geological Survey Hawaiian Volcano Observatory, smoke and lava explode from Kilauea volcano on Hawaii’s Big Island. Molten lava and rocks went flying through the air after part of the crater wall collapsed and caused the explosion. (USGS Hawaiian Volcano Observatory via AP)