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Singapore-based terrorism expert Rohan Gunaratna said Nasar's capture is a major blow to the al-Qaida movement because he was the "most prolific writer" of jihadi propaganda and held close links with extremists throughout Europe and South Asia.
"The ideologues are as equally important as the operational people and he was in close contact with very prominent figures with movements in different countries, particularly the North African region," Gunaratna said.
In 2004, Nasar released a 1,600-page book titled "The International Islamic Resistance Call," which lays out strategies for attacking Islam's enemies.