The idea is to have global standards. There is so much travel that if you just had a regional standard, it would probably ultimately have to be changed.

The European Borders Agency in Warsaw has been created to help border forces in Europe cooperate more.

We are familiar with terrorism. But indiscriminate, cross-border, religiously motivated terrorism is new.

In intelligence work, there are limits to the amount of information one can share. Confidentiality is essential.

Police forces collect information to be used in a public court to get people convicted. Security services gather information that does not necessarily lead to people being prosecuted and in many cases needs to remain confidential.

Europe has a long and tragic history of mostly domestic terrorism.

Muslim organisations tend to have a low level of organisation. The communities in Europe are quite diverse.