It was confirmed today that a number of schools in the County Durham region received emails threatening some sort of attack this week.
But police have moved to reassure parents and the public that they aren’t being treated as credible.
Police forces across the country are also believed to have reported similar incidents.
The emails informed schools that they will be targeted in an attack.
But chief inspector Catherine Clarke, from Durham Constabulary, issued a statement this afternoon, saying: “We can confirm that at this time we believe none of the threats received by schools to date are considered to be credible.
“In the absence of any further threats being received, schools do not need to take any further action.
“If any further threats are received they should be reported immediately to police.
“We are in contact with the schools in our area to give guidance and reassurance.
“More than 100 schools in the North-East region have received the emails and we are working with neighbouring forces to establish the facts and investigate who is responsible.”
Anyone with any information that could assist police should contact Durham Constabulary on 101, or Crimestoppers anonymously on 0800 555 111.