A short nineteen page analysis by Raffaello Pantucci, of ICSR, presented in July 2011 at Chatham House:http://www.chathamhouse.org/sites/de..._terrorism.pdf

This paper will explore the current state of the threat to Europe, how it is connected to the broader threat that is faced in the United States and how it has evolved in this direction. In concluding, it will offer some thoughts on the current direction the threat is going and sketch out some problems that
Europe might face in countering it.... Nevertheless, violent Islamist terrorism with its preference for large-scale multiple strikes using suicide bombers often
coordinated by outside actors continues to be the main threat that is focused on by European security services.
Several references are made to information recovered in OBL's home.

Regarding Preventing / Countering Violent Extremism (PVE / CVE):
the world has not yet found an effective and comprehensive solution to the problem of young people becoming excited by globalist Islamist anti-establishmentarian narratives and becoming persuaded to go and fight abroad and in some cases come back and plot terrorist acts. Broadly captured under the banner of Preventing Violent Extremism (PVE) by the British government and subsequently emulated by many, the world has notably not managed to crack this code.
Ends with:
While it is clear that intelligence services across Europe have now begun to understand what it is that they are facing and to go
about chasing it, they remain unclear of how exactly to stamp it out. Consequently, ten years after 11 September 2001, Europe is continuing to manage its terrorist problem rather than eradicate it.