British police say that after raids on 10 sites around Liverpool and Manchester Wednesday, 12 people were arrested as suspected terrorists.
Most of them were Pakistanis in Britain on student visas. There have been calls to tighten the visa system.
But Magnus Ranstorp, a terrorism analyst at the Swedish National Defence College, says it’s important to strike a balance. He says it might be more divisive and problematic to tighten procedures.