Dutch police have arrested a former student of the British School in Leiden following online threats to go on a shooting rampage. Schools were closed down in Leiden after the authorities failed to trace the source of the threat launched on internet forum 4chan. Around 20 schools were closed and armed police were on site as a precaution. The suspect had been expelled from the British School in 2011, for behavioural issues and had not been seen at the school since. The police said that the British school had not been threatened and remained open on Monday. More about: Education, Internet, Leiden, Netherlands