U.S. intelligence agencies are operating under the theory that a bomb exploded on the Russian jetliner that crashed Saturday in the Sinai Peninsula but have not gathered definitive evidence on what brought the aircraft down, said a U.S. official who spoke on the condition of anonymity to discuss internal assessments. Analysts are combing through electronic and digital communications intercepted from Islamic State as well as extremist groups in Egypt and Sinai before and after the crash to see whether a terrorist group played a role in the crash, the official said. No U.S. citizens were aboard the flight, so direct access to the crash site, the flight data and voice recorders and plane parts...
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