THE INTERVIEW - Matthew Levitt, Director, Stein Program on Counterterrorism and Intelligence

More than a decade after the World Trade Center attacks, the global threat posed by Islamic extremism has shifted. Al Qaeda-linked fighters have poured into Syria and West Africa. Hundreds of Europeans and dozens of US citizens have been radicalised by extremist internet propaganda and have joined the fighting in Syria. Matthew Levitt is a recognized authority on Islamic terrorism. He points out the weaknesses of the current US counterterrorism strategy.

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