Investigators of the Russian plane crash in Egypt are "90 percent sure" the noise heard in the final second of a cockpit recording was an explosion caused by a bomb, a member of the investigation team told Reuters on Sunday.
Chemical weapons experts have determined that mustard gas was used in a Syrian town where Islamic State insurgents were battling another rebel group, according to a report by an international watchdog seen by Reuters.
Evidence now suggests that a bomb planted by the Islamic State militant group is the likely cause of last weekend's crash of a Russian airliner over Egypt's Sinai peninsula, U.S. and European security sources said on Wednesday.
President Barack Obama said on Monday the planned deployment of dozens of U.S. special forces to Syria to advise opposition forces fighting Islamic State did not break his promise not to put "boots on the ground" in the Syrian conflict.
