A girl was reportedly injured amid a protest at a school that "got out of hand". There were reports of students "breaking fences" and "throwing tables".
Pictures showed groups of children gathered at the school fences. Some were seen climbing them as the protest took place on Friday.
Pupils also shook the fence as they chanted and shouted. A parent said that some fences had been broken and another claimed that a girl had been injured. There was also a report that an ambulance had been called.
A parent told Cornwall Live: "Just to let you know that my daughter has just called me to say the protest has got out of hand and students are flipping tables. The children are now not allowed out for break."
A message was posted on Facebook last night as students planned the 'protest'. It came after Penrice Academy in St Austell announced new rules, including only going to the bathroom outside of lesson time and girls requesting red card passes when they are on their period.
It read: "Dear all Penrice students. We are protesting tomorrow about toilet rights. Please join if you can this will run through period 1, 2, 3, 4 and will take place outside reception and year 7 yard. We will all spread out through the school and please make posters and signs.
"Like I said please join if you can. Repost this on your story and spread the message."
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In a message to parents, the school said: "Dear Parent/Carer, due to a social media post yesterday evening, some of our students took the decision to protest. Our students have the right to express their opinions in a calm and safe manner, however a small number of students' behaviour was unacceptable.
"A number of parents have already been contacted to collect their children. For the majority of our students, lessons and lunch time will continue as normal. If you have not been contacted, there is no need to collect your child.
"We hope to engage with them to find a solution that works for everyone as soon as possible. The safety and wellbeing of our students is always our priority."
Cornwall Live has contacted Devon and Cornwall Police and South West Ambulance Service for information.