Workers place battens around a war memorial statue outside the building of the Royal Exchange in London on March 31, 2009. The British capital is bracing for protests before and during the summit of the Group of 20 Countries, to be held on April 2. [Xinhua]

Policemen stand guard on a closed road beside the Winfield House, the official residence of the United States ambassador to Britain where US President Barack Obama will stay during the summit of the Group of 20 Countries (G20), in London on March 31, 2009. [Xinhua]