The greatest decline occurred in Russia where terrorist attacks were down from 396 in 2010 to 238 in 2011.
In contrast, Turkey experienced a spike in terrorist attacks, rising from 40 in 2010 to 91 in 2011.
Together, Russia and Turkey suffered almost 70 per cent of all 2011 terrorism-related deaths in Europe and Eurasia, the report said.
The number of terrorist attacks in East Asia and the Pacific declined for the fifth consecutive year, falling 25 per cent from 724 in 2010 to 543 in 2011, and 62 per cent from the peak of 1,423 in 2007.
Thailand and the Philippines continued to be the primary terrorist targets in the region, it said.
Sunni extremists accounted for the greatest number of terrorist attacks and fatalities for the third consecutive year, the State Department report said, adding that more than 5,700 incidents were attributed to Sunni extremists, accounting for nearly 56 per cent of all attacks and about 70 per cent of all fatalities.
"Among this perpetrator group, Al Qaeda (AQ) and its affiliates were responsible for at least 688 attacks that resulted in almost 2,000 deaths, while the Taliban in Afghanistan and Pakistan conducted over 800 attacks that resulted in nearly 1, 900 deaths.
Secular, political, and anarchist groups were the next largest category of perpetrators, conducting 2,283 attacks with 1,926 fatalities, a drop of five per cent and nine per cent, respectively, from 2010," it said.
The most active of the secular, political, and anarchist groups in 2011 included the FARC (377 attacks), the Communist Party of India-Maoist (CPI-Maoist) (351 attacks), the New People's Army/Communist Party of the Philippines
(NPA-CPP) (102 attacks), and the Kurdistan Worker's Party (PKK) in Turkey (48 attacks), the report said.
Muslim majority countries bore the greatest number of attacks involving 10 or more deaths, with Afghanistan sustaining the highest number (47), followed by Iraq (44), Pakistan (37), Somalia (28), and Nigeria (12).
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