High-profile events during the Obama presidency focused attention on the risks of deepwater oil drilling in the Exclusive Economic Zone of the U.S. The April 2010 explosion of the Macondo well, the resulting fire and sinking of the "Deepwater Horizon" drilling platform, and oil spill in the Gulf of Mexico occurred shortly after the Interior Department released an ambitious five-year plan for oil and gas development of the U.S. outer continental shelf (OCS). President Obama ordered a moratorium on OCS drilling and appointed a bipartisan committee to determine the causes of the blowout and to recommend policies to prevent future disasters. The commission found major problems in the structure and implementation of the National Contingency Plan under the Oil Pollution Act of 1990, which was enacted following the Exxon Valdez oil spill in Alaska. The Department of Interior agencies responsible for overseeing OCS energy development were reorganized to separate leasing and revenues from safety regulation and enforcement.