The media gather in front of the British School in Voorschoten, The Netherlands, on April 22, 2013. Dutch police arrested a former pupil at a British school in the Netherlands on Monday in connection with a threat to go on a shooting spree that saw armed police deployed and schools closed. Police in the university city of Leiden, just northeast of The Hague, confirmed one person had been arrested following the threat to 'shoot my Dutch teacher and as many students as I can,' made on an internet site over the weekend.