Around ten million demonstrators in 600 countries have marched through cities and towns like Paris, New York and Rome.
Children protesting
Children, families, students and old people have been taking to the streets across the globe.
In New Zealand, the environmental group Greenpeace flew a banner reading "No War, Peace Now".
Smaller rallies took place in Nepal, India, Cyprus, Syria, Egypt and Iraq.
And on the tiny South Pacific island nation of Fiji an anti-war group sent messages of flowers to embassies.
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