The police arrested four men in Rotterdam on Sunday evening on suspicion of involvement in terrorism, the Public Prosecutor said in a statement on Tuesday. The suspects are three Dutch men and one Swedish man.
A foreign police service informed the Dutch authorities about the 29-year-old Swede's possible involvement in terrorism. He arrived in the Netherlands on a plane from Stockholm on Sunday afternoon. The police kept an eye on him, and arrested him with the three Dutch men early in the evening.