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A Chinese Ilyushin IL-76 aircraft comes in for a landing at Perth International Airport after returning from the ongoing search operations for missing Malaysia Airlines Flight 370 in Perth, Australia, Thursday, April 10, 2014. With hopes high that search crews are zeroing in on the missing Malaysian jetliner's crash site, ships and planes hunting for the aircraft intensified their efforts Thursday after equipment picked up sounds consistent with a plane's black box in the deep waters of the Indian Ocean. (AP Photo/Rob Griffith)

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Spectators take photos of a Chinese Ilyushin IL-76 aircraft as it comes in for a landing at Perth International Airport after returning from the ongoing search operations for missing Malaysia Airlines Flight 370 in Perth, Australia, Thursday, April 10, 2014. With hopes high that search crews are zeroing in on the missing Malaysian jetliner's crash site, ships and planes hunting for the aircraft intensified their efforts Thursday after equipment picked up sounds consistent with a plane's black box in the deep waters of the Indian Ocean. (AP Photo/Rob Griffith)

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Spectators take photos of a Chinese Ilyushin IL-76 aircraft as it comes in for a landing at Perth International Airport after returning from the ongoing search operations for missing Malaysia Airlines Flight 370 in Perth, Australia, Thursday, April 10, 2014. With hopes high that search crews are zeroing in on the missing Malaysian jetliner's crash site, ships and planes hunting for the aircraft intensified their efforts Thursday after equipment picked up sounds consistent with a plane's black box in the deep waters of the Indian Ocean. (AP Photo/Rob Griffith)

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ADVANCE FOR RELEASE MONDAY, APRIL 14, 2014, AND THEREAFTER- This March 20, 2014, photo shows the John T. Montford Dam at Lake Alan Henry in Texas. The lake lost roughly 4 billion gallons of water to evaporation in 2011, thanks to a lingering drought and sweltering temperatures and still more water is simply missing, according to federal government data. (AP Photo/Lubbock Avalanche-Journal, Stephen Spillman)

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ADVANCE FOR RELEASE MONDAY, APRIL 14, 2014, AND THEREAFTER- In this March 18, 2014 photo, fishermen troll for their next catch at Lake Alan Henry in Texas. The lake lost roughly 4 billion gallons of water to evaporation in 2011, thanks to a lingering drought and sweltering temperatures and still more water is simply missing, according to federal government data. (AP Photo/Lubbock Avalanche-Journal, Stephen Spillman)

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ADVANCE FOR RELEASE MONDAY, APRIL 14, 2014, AND THEREAFTER- In this March 18, 2014 photo, Eric Best looks out over his neighbors boat dock that no longer floats due to low lake levels at Lake Alan Henry in Texas. The lake lost roughly 4 billion gallons of water to evaporation in 2011, thanks to a lingering drought and sweltering temperatures and still more water is simply missing, according to federal government data. (AP Photo/Lubbock Avalanche-Journal, Stephen Spillman)

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ADVANCE FOR RELEASE MONDAY, APRIL 14, 2014, AND THEREAFTER- In this March 18, 2014 photo, fishermen troll for their next catch at Lake Alan Henry in Justiceburg, Texas. The lake lost roughly 4 billion gallons of water to evaporation in 2011, thanks to a lingering drought and sweltering temperatures and still more water is simply missing, according to federal government data. (AP Photo/Lubbock Avalanche-Journal, Stephen Spillman)

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Sen. Rand Paul will speak at the Freedom Summit, an event that confirms to locals that the 2016 primary season has begun in New Hampshire. (Associated Press)

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FILE - This Feb. 9, 2011 file photo shows Federal Energy Regulatory Commission (FERC) Acting Chair Cheryl LaFleur speaking in Omaha, Neb. LaFleur, the top federal energy regulator says her agency is taking steps to improve handling of classified national security information, following a report that officials improperly allowed widespread access to a document that outlined specific physical threats to the nation's electric grid. LaFleur told the Senate Energy Committee Thursday that employees are "wiping and scrubbing all databases" among steps to protect sensitive information. (AP Photo/Nati Harnik, File)