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In this Russian Emergency Situations Ministry photo, made available on Monday, Nov. 2, 2015 Russian and Egyptian experts work at the crash site of a Russian passenger plane bound for St. Petersburg in Russia that crashed in Hassana, Egypt's Sinai Peninsula, on Monday, Nov. 2, 2015. A Russian cargo plane on Monday brought the first bodies of Russian victims home to St. Petersburg, from Egypt.(Russian Ministry for Emergency Situations photo via AP)
In this Russian Emergency Situations Ministry photo, made available on Monday, Nov. 2, 2015 Russian and Egyptian experts work at the crash site of a Russian passenger plane bound for St. Petersburg in Russia that crashed in Hassana, Egypt's Sinai Peninsula, on Monday, Nov. 2, 2015. A Russian cargo plane on Monday brought the first bodies of Russian victims home to St. Petersburg, from Egypt.(Russian Ministry for Emergency Situations photo via AP)

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U.S. official: '99.9% certain' bomb took down aiplane

Egyptian officials still say that it is soon to tell what caused a Russian airplane to crash in the Sinai Peninsula, but some U.S. officials are confident that it was a bomb that took down the plane.

U.S. official: '99.9% certain' bomb took down aiplane

Egyptian officials still say that it is soon to tell what caused a Russian airplane to crash in the Sinai Peninsula, but some U.S. officials are confident that it was a bomb that took down the plane.