National Transportation Safety Board chair Deborah Hersman speaks prior to testimony during a hearing on pipeline safety in Charleston, W.Va., Monday Jan.28, 2013. Before the hearing, Rockefeller criticized the U.S. Office of Management of Budget for slowing down potential safety rules meant to respond to the Sissonville explosion and similar accidents. (AP Photo/Charleston Daily Mail, Tom Hindman)

Associated Press
National Transportation Safety Board chair Deborah Hersman speaks prior to testimony during a hearing on pipeline safety in Charleston, W.Va., Monday Jan.28, 2013.  Before the hearing, Rockefeller criticized the U.S. Office of Management of Budget for slowing down potential safety rules meant to respond to the Sissonville explosion and similar accidents. (AP Photo/Charleston Daily Mail, Tom Hindman)
National Transportation Safety Board chair Deborah Hersman speaks prior to testimony during a hearing on pipeline safety in Charleston, W.Va., Monday Jan.28, 2013. Before the hearing, Rockefeller criticized the U.S. Office of Management of Budget for slowing down potential safety rules meant to respond to the Sissonville explosion and similar accidents. (AP Photo/Charleston Daily Mail, Tom Hindman)
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