"A police investigation is under way to find the person responsible."
However, UK daily The Telegraph and Daily Mail reported Tuesday that a Russian group of Putin-sympathizers, who also support the Assad regime, claimed responsibility for the threats via tweets.
The group, which called themselves 'Evacuators 2K16', invited students to get in touch if they wanted to 'get out of school'.
With a Twitter profile picture of Vladimir Putin and a ".ru" domain name, some of the group's tweets said: 'Schools in Paris dropping like flies', and 'How's the West Midlands doing?'.
The group with the Twitter handle @Ev4cuati0nSquad has been shut down and is being investigated.