Why six men deemed 'national threats' can't be deported

6:44 min

Six men, called national security threats by the security agency Säpo, have been released from custody after the government's decision to deport them could not be carried out.

This has prompted some strong reactions, with the leader of the biggest opposition party, the Moderates, saying it's "unacceptable that their security takes precedence ahead of Sweden's security".

To find out why the men can't be deported and what options the government has left, Radio Sweden sat down with Mark Klamberg, a professor of international law at Stockholm University.