Carl Bildt, former prime minister of Sweden, shares his perspective on European politics.

What is the story about the new terrorist threat against Sweden?

Well, it is worrying. The security authorities back home have now elevated the threat level from three to four on a scale of five. And that's the consequences, of course, of the Quran burnings that have happened in both Sweden and Denmark during the past few weeks. And that had led to, understandably so, a very strong reaction, primarily in the Muslim countries. These are irresponsible acts done by isolated individuals. The authorities in both countries are seeing what legal actions could be taken, but in the meantime, a very difficult situation that needs to be handled by the Swedish and Danish authorities.