A Royal Dutch Shell oil drilling rig is towed toward a dock in Elliott Bay, Seattle, in May. Three weeks after Royal Dutch Shell announced it was walking away from exploratory drilling in U.S. Arctic waters, the Obama administration has taken steps to keep drill rigs out of Alaska's northern ocean for a decade or more. Elaine Thompson/AP hide caption

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Islamist militants raided the In Amenas natural gas field (pictured) in Algeria on Wednesday and took several hostages. BP/AP hide caption

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