Liquefied natural gas vapors continue to leak leaving a frosty coating, Tuesday, April 1, 2014 on the damaged storage tank at the Northwest Pipeline facility near Plymouth, Wash. State and federal regulators looking for what caused the explosion at the liquefied natural gas facility began interviewing injured workers as an evacuation order covering hundreds of nearby residents was lifted. (AP Photo/Tri-City Herald, Bob Brawdy)
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