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What's the U.S. plan on Russia's "all out" invasion? Plus, a look at the strategy for fighting ISIS.
(CNN) - Olympic officials discounted an e-mailed threat to the upcoming Winter Games in the Russian city of Sochi on Wednesday, but the reported warning raised new concerns about security at the events.
Olympic organizing committees in the United States and several European countries got an e-mailed warning of a terrorist attack against visitors to Sochi, where President Vladimir Putin's government has mounted a massive security effort to protect the events.