We are aware of a number of schools receiving malicious threats today via e-mail.
This is the latest update from Durham County Council to schools:
We have received a number of calls from schools in our region reporting that they have been sent threatening emails.
Police forces across the country are also believed to have reported similar incidents.
The emails inform the school that they will be targeted in an attack later today.
Enquiries are continuing to establish the facts and forces are working together to investigate the threat and who is responsible.
We are requesting that parents do not ring the police as we are in contact with the schools to offer advice and reassurance, and to keep them updated on the investigation.
We take all incidents of this nature extremely seriously.
As always, we will be vigilant at the end of the school day but as the police believe these messages to be a hoax, we will be following all advice to leave as normal at the end of the school day.