The top Democrat on the House Intelligence Committee says if investigators confirm a claim that the Islamic State group blew up a Russian plane, it would mean that the extremist group has "eclipsed al-Qaida as the gravest terrorist threat in the world." California Rep. Adam Schiff appeared on ABC's "This Week."
British Foreign Secretary Phillip Hammond told the BBC on Sunday that if the bomb is confirmed, it will require a potential rethinking of airport security in all areas where the extremist group is active.
U.S. and British officials say intelligence suggests that the plane that crashed in Egypt last weekend was likely brought down by a bomb on board.
All 224 people aboard were killed when the Oct. 31 flight from Sharm el-Sheikh to St. Petersburg broke apart over Egypt's Sinai Peninsula.
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