Children have been evacuated from a school with Year 11 students told to leave mid-exam after a threat was made via email.
Police have urged parents to stay away from the scene at Myton School in Warwick following the incident.
An ambulance was called to the school at 11.44am on Monday with two paramedics attending.
Warwickshire Police said that all pupils were safely evacuated out of the school in response to the 'unspecified threat'.
It is understood that paramedics did not need to treat anybody at the scene and that they later stood down.
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Police have urged parents to stay away from the scene at Myton School in Warwick following the incident
Myton School posted on Facebook: 'Parents and carers, this morning we received a vague threat via email against our school.
'As always the first priority was the safety of students and staff, who were all evacuated from the buildings.
'We appreciate the communication was difficult at this time as we had such limited access to systems.
'Thank you very much for your prompt responses which allowed us to send Year 7 to 10 students home.
'We are working on a plan to get Year 11 and above students home as they were evacuated out of exams without their phones and other personal belongings.'
The school also thanked its staff, pupils and police for their response to the situation.
Chief inspector Faz Chishty, local policing commander for south Warwickshire, said: 'Thank you to everyone for your patience and understanding while we respond to this incident.
'I'd like give credit to the staff and students for how they responded. Police will remain at the scene for some time. We will keep you updated.'
A spokesperson for West Midlands Ambulance Service said: 'We were called to an incident at Myton School in Warwick at 11.44am.
'Two paramedic officers were sent to the scene. There were no patients requiring treatment and we were stood down.'
MailOnline has contacted Myton School and West Midlands Ambulance Service for further comment.
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