The schools across East Yorkshire reported receiving threatening emails about a bomb on Friday morning.
According to the Hull Daily Mail, the threats have been made nationwide but this has not been confirmed by other police forces.
One school Aldbrough Primary said it believes the email is a hoax but has contacted the police.
You may have heard in the press about hoax emails being sent into Schools with a bomb threat. We wanted to alert you to the fact that Driffield School has received a threat this morning. We have been visited by the police who are treating this as a hoax.
Posting on Facebook, the school said: “Dear Parent/carers, last term a number of schools received hoax bomb threats.
We have received a bomb threat email this morning. We have informed the police and they are on the way.
Our advice is that we take the threat seriously even though it does only appear to be a hoax.
Detective Chief Inspector Stewart Miller said: “We’ve been made aware of a hoax email sent to schools in the force area this morning 13 April 2018. We want to categorically reassure parents and children, staff and the wider public that this a non credible threat that has been sent nationwide.
Our primary concern is to ensure that schools are given guidance, up-to-date information and reassurance and above all that everyone is safe. Community officers have already been sent to schools to provide that reassurance.
It is not yet clear how many schools in the UK have been targeted.