Polish police have arrested a string of young people, mainly for making threats related to school attacks, they said on Friday, as authorities sought to calm fears spurred by rumours online of a “Bloody Friday” after two stabbing sprees in as many days. Social media in Poland has been filled with talk of a supposed online challenge that could be behind the attacks, but police on Friday said their investigations had found no evidence of this. The incidents have prompted a nationwide security...
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