U.S. uses Yemeni Web sites to counter al-Qaeda propaganda
Found on Washington Post on Thursday, 24 May 2012
When al-Qaeda recruitment propaganda appeared on tribal sites in Yemen, Clinton said, “within 48 hours, our team plastered the same sites with altered versions . . . that showed the toll al-Qaeda attacks have taken on the Yemeni people.”
Clinton said the campaign was conducted by the Center for Strategic Counterterrorism Communications, based at the State Department, with expertise drawn from the military and the intelligence community.
If I'm not mistaken, the US said that they consider hacks originating from another country as an act of terrorism and a reason to use their military power at its full extend in "self-defense". Al-Qaeda could now argue in a similar way and use this as a reason to attack the US once again.