In London's Trafalgar Square, people came dressed in pyjamas, dressing gowns and fancy dress to take part in the mass pillow fight on Saturday afternoon.
Most people carried feather-filled pillows that exploded as they fought.
London's Metropolitan Police said on Sunday that the event had been peaceful and they had no reports of any trouble.
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Organisers listed similar events in more than 130 cities around the world.
The fights were organised by The Urban Playground Movement which wants to encourage people to make use of public spaces.
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