Britain's Prime Minister Tony Blair (R) stands with police officers as he observes a two-minute silence in memory of the victims of the London bombings, in the garden of 10 Downing Street in London, July 14, 2005. (Xinhua/AFP photo)

Thousands of Londoners gathered at Trafalgar Square in the downtown area on July 14 for a vigil to remember the victims of last Thursday's bombings in London. (Xinhua/AFP Photo)

British troops stationed in Afghanistan observe silence for bombing victims.

People in Britain and across Europe observe a two-minute silence at 12:00 am Thursday to remember victims of last Thursday's bombings in London.