28 March 2018
On the evening of Wednesday 28 March, NCA and Hertfordshire Police officers arrested an 18-year-old man in the Abbots Langley area on suspicion of making malicious communications relating to the threatening emails received earlier today by a large number of schools and colleges throughout the UK.
We understand these threats have caused considerable concern but we do not assess there to be an increased risk to the public.
We believe this incident is linked to the hoax bomb threat that closed hundreds of UK schools last week.
As this is a live investigation we are unable to comment further.