Police officers were called to a Hartlepool school after they received a “concerning call” over lunchtime.
Cops attended High Tunstall College of Science, in Elwick Road, and the school was evacuated as officers searched the buildings.
Mark Tilling, headteacher of the school, said he found the hoax to be “extremely frustrating” as pupils’ had their education disrupted as they had to be told to go home for the day.
He said: “At 12.31pm today, the school received a telephone call from someone claiming that there was a bomb in the school.
“We followed our emergency procedures by immediately calling the police and evacuating the school. We took the decision to send children home whilst a police search was undertaken. Nothing suspicious was found and the school will be open as normal on Tuesday, January 20.
“Hoax calls like this cannot be taken lightly but it is extremely frustrating that students’ education has been affected.
“We will continue to work with the police and other agencies to try and identify who made the call.”
A Cleveland Police spokesman said: “Police were notified by High Tunstall School that they had received a concerning call over lunchtime today.
“The school was evacuated according to their own procedures and the building was thoroughly searched by police.
“Nothing of any concern was found, there is no danger to any student, member of staff or local resident and officers are continuing their enquiries into the source of the call.”