Paris attacks mark escalation in terrorist tactics
The sophistication, resources and scale of Friday’s attacks in the heart of Paris underscored to officials across the globe that the challenges of containing extremist violence have reached a new level, and that the calculus of the Western effort against terrorism had fundamentally changed.
European governments in the past few months have sought various means to guard against national security threats, with some erecting barbed-wire fences to stem the flow of migrants, while others, including France, devoted hundreds of millions of euros to strengthening electronic surveillance systems. 
Friday’s attacks highlight the weakness of those strategies in a world where global extremism flows across nations. It also raises questions about transnational agreements on open-border travel that have been a bedrock of modern Europe. In his first comments to the nation after the attack, French President François Hollande announced the closing of his country’s borders.
French authorities did not immediately name a culprit, but the nature of the attacks left little doubt they were the work of a well-organized terrorist group. A French official said Friday the attacks were “unfortunately well-prepared and coordinated.” The apparent use of explosives and the likelihood that a significant number of people were involved were particularly alarming to U.S. counterterrorism officials.
At the same time, officials in several countries have voiced strong suspicions that the recent downing of a Russian passenger plane over Egypt was the work of a terrorist bomb. If Islamic State or another terrorist group is blamed for that attack, in addition to Friday’s carnage, pressure could increase to ramp up the war on such terrorist organizations to a new level. That could include more pressure on Western countries to step up the military intervention in Syria. The North Atlantic Treaty Organization does not have a formal role in strikes against Islamic State, although members of the alliance are taking part in the U.S.-led coalition.
source:Market watch
