A somber President Vladimir Putin vowed to hunt down and punish those responsible for a bomb that brought down a Russian passenger jet last month, "wherever they are hiding." Intensified Russian airstrikes Tuesday hit the Islamic State group's stronghold in Syria that also is being pounded by the French military. Russia's FSB security service confirmed for the first time that a homemade bomb caused the Oct. 31 crash of the Metrojet Airbus 321-200 in Egypt's Sinai Desert and killed all 224 people aboard in what it called "a terrorist act." The Islamic state had already claimed responsibility, saying it was punishing Moscow for its air campaign in Syria. With Russia striking IS targets in...
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