Boston Marathon Bombing on April 15, 2013 appears to be fake terrorism (strategy of tension)

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A strategy of tension (Italian: strategia della tensione) is a policy wherein violent struggle is encouraged rather than suppressed. It is usually associated when governments, or security apparatuses within a government, allow or even encourage extremist groups to perform attacks, bombings, murders, and the like. In extreme circumstances, it can even involve agent provocateurs and false flag operations where a terrorist threat is outright invented or created. The goal in such strategies is that such a struggle will rally support behind the military or police forces opposing the radicals, to radicalize opposing movements so that they can be better marginalized, or to permit loosely allied extremist groups to attack enemies of the government. As few organizations would openly say that they are pursuing a strategy of tension, accusations generally come from opponents that such a strategy is being pursued.
The strategy of tension is most closely identified with the Years of Lead in Italy from 1968–1982, wherein both far-left Marxist extremists and far-right neo-fascist groups performed bombings, kidnappings, arsons, and murders. Activists have accused NATO of allowing and sanctioning such terrorism, although this conclusion is hotly disputed. Other cases where writers have alleged a strategy of tension include the Turkish military against Islamists from the 1970s–1990s ("Ergenekon"), the war veterans and ZANU–PF in Zimbabwe which coordinated the farm invasions of 2000,and Belgium's state security service from 1982–1986. [Wikipedia]