Maajid Nawaz on Syria, radical Islam and Boston bombings
26 April 2013 Last updated at 10:19 BST
A former Islamist who is now an author campaigning against radical Islam claims Syria could be the new Afghanistan. He predicted further attacks in Western nations, which he described as a "blowblack right here in our streets".
Former political prisoner Maajid Nawaz looked at the security issues raised after the Boston bombings - allegedly by two Chechen Muslims - in his personal film for BBC1's This Week made on the site of some of the 7/7 London bombings in 2005.