With the arrest of Mehdi Nemmouche, a 29-year-old French jihadist who had spent time Syria, on suspicion of killing three people at the Brussels’ Jewish Museum on 24 May, “in one fell swoop, the danger of returned jihad fighters has become tangible”, writes De Volkskrant.

Nemmouche was arrested on 30 May in Marseille during a routine check on bus passengers arriving from Amsterdam. De Volkskrant worries that more European jihadis returning from Syria, who have been dubbed “time bombs”, will carry out further attacks in Europe.