From 9/11 to Paris bloody attacks
New York 9/11: "The September 11 attacks (also referred to as September 11, September 11th, or 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on the United States in New York City and the Washington, D.C., metropolitan area on Tuesday, September 11, 2001. The attacks killed 2,996 people and caused at least $10 billion in property and infrastructure damage." (http://en.wikipedia.org/wiki/September_11_attacks)
Madrid 11-M: "The 2004 Madrid train bombings (also known in Spain as 11-M) were nearly simultaneous, coordinated bombings against the Cercanías commuter train system of Madrid, Spain, on the morning of 11 March 2004 – three days before Spain's general elections and two and a half years after the September 11 attacks in the United States. The explosions killed 191 people and wounded 1,800. The official investigation by the Spanish judiciary found that the attacks were directed by an al-Qaeda-inspired terrorist cell, although no direct al-Qaeda participation has been established." (http://en.wikipedia.org/wiki/2004_Madrid_train_bombings)
London 7/7: "The 7 July 2005 London bombings (often referred to as 7/7) were a series of coordinated suicide attacks in central London, which targeted civilians using the public transport system during the morning rush hour." (http://en.wikipedia.org/wiki/7_July_2005_London_bombings)
Boston: "The Boston Marathon bombings and subsequent related shootings were a series of attacks and incidents which began on April 15, 2013, when two pressure cooker bombs exploded during the Boston Marathon at 2:49 pm EDT, killing 3 people and injuring an estimated 264 others. The bombs exploded about 12 seconds and 210 yards (190 m) apart, near the finish line on Boylston Street." (http://en.wikipedia.org/wiki/Boston_Marathon_bombings)
Paris: "On 7 January 2015, at approximately 11:00 CET (10:00 UTC), three masked men stormed the headquarters of the French satirical magazine Charlie Hebdo in Paris. Early reports suggest that 12 people were killed and 10 injured. The gunmen entered the building and began shooting with automatic weapons—reports indicate up to 50 shots being fired. The incident is France's deadliest attack since 1989 and the second worst attack in peacetime overall, behind the aforementioned incident." (http://en.wikipedia.org/wiki/2015_Charlie_Hebdo_magazine_shooting) "Francois Hollande spoke about a 'terrorist' attack and noted that 'we are threatened because we are a free country'." (http://failedevolution.blogspot.gr/2015/01/11-killed-in-shooting-incident-in-paris.html)
ISIS fighters' threats concerning potential attacks in Western countries serve perfectly the plan, which is to transfer the wars from borders to urban centers. Indeed, since a citizen of any Western country, attached to the ISIS or other extremist groups, is determined to die in a bloodbath at the heart of this country, the protection of borders has no meaning, and citizens start to wonder about the ability of the nation-state to protect them.
It's not accidental that the arms industries demonstrate new weapons designed to be used inside urban areas for suppression of potential riots. There will be no "outside enemy" in the future. The threat for the dominant system will come from the interior, the big urban centers.