“Days after authorities dismissed claims that ISIS brought down a Russian passenger jet, a U.S. intelligence analysis now suggests that the terror group or its affiliates planted a bomb on the plane. British Foreign Minister Philip Hammond said his government believes there is a ‘significant possibility’ that an explosive device caused the crash. And a Middle East source briefed on intelligence matters also said it appears likely someone placed a bomb aboard the aircraft.”
Source: Russian plane crash: U.S. intel suggests ISIS involved – CNN.com