Dutch police have carried out another raid in the port city of Rotterdam, days after detaining a 32-year-old French national on suspicion of involvement in a "terrorist plan".
The Dutch national prosecutor's office said that the raid on Tuesday night did not uncover any weapons or explosives and no suspects were arrested.
The latest raid followed an operation on Sunday night in which the Frenchman and three other suspects were detained by heavily armed police in Rotterdam.
The suspect, who was sought by French authorities, has refused a swift transfer to France and will now go through an extradition procedure.
Two other men detained on Sunday, both from Algerian backgrounds, are due to appear before an investigating judge on charges of "involvement in a terrorist organisation".