Moment of silence in France after Paris attacks. Tolga Akmen/London News Pictures via ZUMA Wire

After Paris

The Islamic State's attacks in Paris, coming on the heels of bombings in Beirut and the downing of a Russian airliner over the Sinai Peninsula, reinforce the reality that the terrorist threat has entered a new and even more dangerous phase. The main lesson is that we must be prepared to act over time and place alike.

NEW YORK – The attacks in Paris by individuals associated with the Islamic State, coming on the heels of bombings in Beirut and the downing of a Russian airliner over the Sinai Peninsula, reinforce the reality that the terrorist threat has entered a new and even more dangerous phase. Just why the Islamic State decided to stage its attacks now is a matter for conjecture; it may well be that it is going global to compensate for its recent loss of territory in Iraq. But whatever the rationale, what is certain is that a clear response is warranted.

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