Incidentally, our railroad facilities are under video surveillance by the federal police. However, the federal and state governments will have to determine whether video surveillance shouldn't be significantly expanded to a certain degree.

Nevertheless, I do know that we are part of a danger zone, we have military operations in Afghanistan and we're training the Iraqi police force. The terrorists also have us in their sights.

We can no longer apply the classic criteria to clearly determine whether and when we should use military force. We are waging war in Afghanistan, for example, but it's an asymmetrical war where the enemies are criminals instead of soldiers.

The attacks on the Paris Metro in the 1990s were committed by members of the local Muslim community, immigrants from the Maghreb region of North Africa.

The terrorists who committed the 2003 Istanbul attacks were locals, that is, Turks. And when filmmaker Theo van Gogh was murdered in the Netherlands last year, the murderer and his supporters were also part of the Muslim community.