France raises terror alert after Moscow concert hall attack

France raises terror alert to highest level after Moscow concert hall attack. Suspects charged with terrorism. Islamic State claims responsibility. U.S. supports conclusion of ISIS involvement. Paris scales back Olympics ceremony due to security concerns.

Terror Alert in France

French government raises terror alert warning to highest level following shootings in Moscow, in light of Islamic State's claim of responsibility and threats against the country. Security measures increased ahead of Olympic Games in Paris.