The German government has deployed thousands of security personnel to control them as the leaders prepare to discuss international security, climate change and the refugee crisis.
Heavy protests greet start of G20 summit in Germany
Biểu tình chống G20 tại Hamburg, Đức Source: AAP
World leaders and central bankers arriving in Hamburg, Germany, for the start of the G20 summit have been greeted by tens of thousands of protesters.
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