A teenage boy has been arrested following reports a pupil stabbed a teacher at Tewkesbury School.
Gloucestershire Constabulary said officers were called to the school in Ashchurch Road this morning.
The force tweeted: “An adult has been taken to hospital with a suspected stab wound following an incident at Tewkesbury School.
“We were called around 9.10am today (Monday) with a report a pupil had stabbed a teacher.
“A teenage boy has been arrested in connection with the incident.”
The school was immediately put on lockdown.
The scene at Tewkesbury School
Sky News correspondent Dan Whitehead said there were dozens of parents waiting outside the school.
He could also see three ambulances and about eight police officers guarding the gate.
Earlier, teachers at the nearby Tirlebrook Primary School posted a message on Facebook saying its school had also been locked down on police advice and urged parents not to come to the school.
“An incident has occurred this morning at Tewkesbury Academy and we have been advised by Tewkesbury Police to put in place a lock down,” they said.
“We have a police presence at school and are being fully supported at this time. We would like to reassure all families that children at Tirlebrook and Little Oaks are safe and well.
“We must ask that families do not come to school during this time as this could compromise the police operation currently underway and also compromise the safety of the children.”
Education Secretary Gillian Keegan said: “I am deeply concerned by reports of a stabbing at Tewkesbury School.
“We are closely monitoring the situation and remain hugely grateful to the emergency services who are currently on the scene.
“My department is on hand to support the school as the situation unfolds.”