Around 40 pupils and one teacher have been treated by paramedics after a mystery illness swept Outwood Academy School in Ripon, North Yorkshire, say police.
The entire school has been evacuated and pupils sent to nearby Ripon Community College.
Emergency services arrived at the scene at around 12.30pm after reports students had collapsed at the school.
Two children have been taken to hospital.
Yorkshire Ambulance Service said its crews treated 40 at the scene for ‘nausea and feeling faint’.
A spokesman said: ‘We dispatched a number of resources to the scene including a doctor, three ambulance crews, two rapid response vehicles, a number of Clinical Supervisors and our Hazardous Area Response Team.
‘Up to 40 students are currently being treated on scene, but we have not conveyed any patients to hospital at this stage.’
The man, who did not wish to be named, said: ‘I rang the school to check my daughter was OK. I was told a couple of children had collapsed during a remembrance service.
‘As it finished another couple went down. That’s when the fire brigade were called.’
Officers are working with the fire and ambulance services to establish what has caused the students to collapse.
A spokesperson for North Yorkshire Police added: ‘At this time, the safety of all the students and staff at the school is paramount and officers are working with the fire and ambulance services to establish what has caused the students to collapse.’
More than 350 pupils aged 11 to 18 attend The Outwood Academy, according to its website.
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