According to the source , authorities have increasing confidence about the safety of Sochi and the Olympic venues . Two U.S. officials tell CNN that information was shared with the Russians . Source says threat is specific to start of the Olympics this week . Official tells CNN that Russians shared some information with U.S . Warning to airlines globally , warning travelers in Russia and Ukraine.
Two U.S. officials tell CNN that information was shared with the Russians . Source says threat is specific to start of the Olympics this week . Official tells CNN that Russians shared some information with U.S . Warning to airlines globally , warning travelers in Russia and Ukraine.