A famous stencil by graffiti artist Banksy, reworked to depict a Syrian refugee girl with a heart-shaped balloon, was projected on Nelson's Column in Trafalgar Square.
Most of the demonstrators were Syrians, as was the case at a similar event in Rome, where 3,000 people marched through the city centre to protest against the regime of President Bashar al-Assad.
Hundreds also showed up in Madrid and in Paris, where messages of support to Syria were lit up on the Eiffel Tower.
"We are here today, three years after the start of the repression and the conflict, to support the Syrians who are there and in our country," the head of the French branch of Amnesty International, Genevieve Garrigos, told AFP.
In Washington, around 1,000 people chanted "revolution" and other slogans against Assad. They gathered in front of the White House and read out the names of some of the conflict's victims.
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Most of the demonstrators were Syrians, as was the case at a similar event in Rome, where 3,000 people marched through the city centre to protest against the regime of President Bashar al-Assad.
Hundreds also showed up in Madrid and in Paris, where messages of support to Syria were lit up on the Eiffel Tower.
"We are here today, three years after the start of the repression and the conflict, to support the Syrians who are there and in our country," the head of the French branch of Amnesty International, Genevieve Garrigos, told AFP.
In Washington, around 1,000 people chanted "revolution" and other slogans against Assad. They gathered in front of the White House and read out the names of some of the conflict's victims.
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