Four arrests were made by the military police on Wednesday evening in connection with the terrorist threat at Amsterdam’s Schiphol airport, reports ANP. The public prosecution service said no details were available ‘in the interests of the investigation’.

The airport was put under extra security measures earlier in the day on the advice of the national terrorism coordinator following a threatening letter. According to some reports the police were on the look out for a car with German number plates.
Justice minister Ernst Hirsch Ballin, who was informed of the threat on Wednesday morning, said in a first reaction that ‘effective action’ had been taken.
The extra security measures were suspended following the arrests.