Two pupils were arrested when a protest about Red Nose Day being 'banned' at Hounslow Manor School spiralled out of control, it has emerged.
Hundreds of students ran riot in the playground at Hounslow Manor School on Friday 13 after head teacher Anjali Sakhardande rejected their calls for a 'mufti' day, where pupils are allowed to wear their own clothes in exchange for a donation to Comic Relief.
Youngsters swapped their uniforms for casual wear at lunchtime in defiance of the ban, brandishing placards and chanting 'Red Nose Day'.
Footage of the protest posted on the video-sharing website YouTube shows one pupil appearing to lob a missile at police and teachers as they attempted to calm students down.
Cops, who were already on site for a pre-arranged meeting, had to arrest two teenagers to prevent a 'breach of the peace'.
However, Hounslow sector inspector Huw Evans confirmed they were released without charge.
"There are no offences or crimes being investigated and this is a matter for the school to deal with," he added.
A spokesman for the school denied claims one of its teachers was injured during scuffles and blamed the incident on a misunderstanding by pupils.
"We decided a non-uniform day for Red Nose Day would be unfair on our children from disadvantaged backgrounds," he said. "We encouraged students to find other ways to raise money, such as making eye masks, which they did admirably.
"The breaktime protest was well organised. Representatives met with the head to discuss their concerns, where they acknowledged they had not been prevented from raising money.
"When the protest came to an end, a small number of students went too far. The police - who were on site for a pre-arranged meeting - dealt with them appropriately."
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