Russia has concluded that the Metrojet crash in the Sinai Peninsular on Oct. 31 was caused by "a homemade bomb containing up to 1 kilogram of TNT," Alexander Bortnikov, the head of Russia's FSB security service said. "Our air force's military work in Syria must not simply be continued," Russian President Vladimir Putin said. "It must be intensified in such a way that the criminals understand that retribution is inevitable." A source in the French government told Reuters that Russian warplanes launched airstrikes on Raqqa on Tuesday. Egyptian authorities arrested two employees at the Sharm el-Sheikh airport suspected of possibly smuggling the bomb aboard the plane.
