Britons are increasingly heading to the Middle East for terrorist training in preparation for attacks in the wake of the Arab Spring, according to the Director General of MI5 Jonathan Evans.
Evans warned that parts of the Arab world were becoming a "more permissive environment" for al Qaida and Britons were travelling there to "seek training and opportunities for militant activity."
In his first public speech since September 2010, Evans said Britain had experiences a "credible terrorist attack plot about once a year since 9/11" and warned that the threat of al Qaida attacking the UK is real, ongoing and growing.
- Up to 200 British residents and nationals are currently in Arab world terrorist training camps
- The camps are spread across the Arab world: Yemen, Libya, Nigeria and Egypt are all understood to pose a risk
Evans said that although UK defences are robust the threat of Islamic terrorist attacks coming from inside the UK is serious.
He admitted the Olympics would be "an attractive target" for terrorists but said they would not be an easy one.