Dozens of schools in the Netherlands were closed on Monday, and thousands of students stayed at home after an anonymous message posted on the internet threatened a shooting spree, police said.
Police detained a former student of the British School near Leiden on suspicion of making the threat, the Dutch force said in a statement.
The person who posted the message said he or she intended to "shoot my Dutch teacher and as many students as I can" at the school. The posting also showed a picture of a pistol.
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