FILE - This is a file image taken from video and released Monday, Feb. 7, 2011 by The Kavkaz Center, a website affiliated with Chechen rebels, of insurgent leader Doku Umarov speaking in a video. An Islamic militant group in Russia's North Caucasus is reporting the death of Doku Umarov its leader, who had threatened to attack Sochi Olympics and was one of Russia's most wanted men. The Caucasus Emirate announced the "martyrdom" of Umarov in a statement posted Tuesday on the website of Kavkaz Center, which serves as a mouthpiece for Islamic militant groups. No cause was given. (AP Photo/The Kavkaz Center, File) NO SALES
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