There is no evidence yet of terrorism in the Russian airline crash in Egypt. However, investigator aren't ruling out ISIS involvement. CBS News national security correspondent David Martin joins CBSN to discuss.
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Islamic StateEgyptian authorities say there is no evidence of terrorism in the crash of a Russian plane in the Sinai peninsula. CBS News Foreign..
U.S. intelligence says it's unlikely terrorism brought down the Russian plane that crashed Saturday, killing over 200 people. But..
U.S. intelligence sources tell CBS News a missile or rocket propelled grenade likely did not bring down the Russian jetliner over..