The national hoax closed hundreds of schools around the UK on Monday (March 19). It is still not clear which schools in Cambridgeshire received the threat, which is understood to have been sent via e-mail, but it is understood that Brampton Village Primary School was among them. A National Crime Agency spokesman said: Hertfordshire police officers, working as part of an NCA-led investigation, arrested a 19-year-old man in Watford today on suspicion of blackmail and making malicious communications relating to the hoax bomb threat that closed hundreds of UK schools this week. We understand parents and teachers concerns but stress there was no credible threat to the emails schools received. However we are taking the communications extremely seriously. As this is now a live investigation we are unable to comment further.