Excerpt:
The number of militant extremists living in Sweden has soared from a couple of hundreds a few years ago to thousands today, the security police Säpo believes.
"We have never seen anything like it before," said Säpo chief Anders Thornberg in an interview with Swedish news agency TT.
The vast majority of the extremists support violent Islamist ideologies, according to Säpo, whose security experts in a report in 2010 estimated that there were around 200 such sympathizers in Sweden.
"We would say that it has gone from hundreds to thousands now," said Thornberg.