Russia and China have vetoed a bid by the U.N. Security Council to refer the Syrian Civil War to the International Criminal Court.
A resolution had been put forward to refer the Syrian war to the criminal court for possible prosecution for war crimes and crimes against humanity committed during the three year war.
More than 150,000 people have been killed during the conflict.
The two countries have now blocked action being taken by the U.N. Security Council four times.
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As the silence came to an end the crowd began to applaud and people shouted "I am not afraid!" in defiance of the attacks.