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