Revellers take part in a giant pillow fight in Trafalgar Square on 'International Pillow Fight Day' on April 4, 2015 in London, England.
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London marks International Pillow Day with pillow fight

5 April 2015 Last updated at 10:41 BST

Hundreds of people have gathered in Trafalgar Square in London to mark International Pillow Day.

It is an annual event that takes places across the globe and a chance for people to have a friendly fight with each other using pillows.

Big pillow fights also took place in Romania, the Netherlands and Hong Kong.

But there were a few rules for pillow fighters to follow: don't hit anyone without a pillow, don't hit anyone with a camera, and take your pillow home.