Police officers and members of muslim community walk across Westminster Bridge to commemorate the victims of last week's terror attacks in London, Britain on March 29, 2017. (Xinhua/Ray Tang)
National Health Service nurses hold flowers in an event on Westminster Bridge to commemorate the victims of last week's terror attacks in London, Britain on March 29, 2017. (Xinhua/Ray Tang)
Police officers and members of muslim community attend an event on Westminster Bridge to commemorate the victims of last week's terror attacks in London, Britain on March 29, 2017. (Xinhua/Ray Tang)
Members of muslim community attend an event on Westminster Bridge to commemorate the victims of last week's terror attacks in London, Britain on March 29, 2017. (Xinhua/Ray Tang)
Children lay flowers on Westminster Bridge in an event to commemorate the victims of last week's terror attacks in London, Britain on March 29, 2017. (Xinhua/Ray Tang)
Police officers and members of muslim community attend an event on Westminster Bridge to commemorate the victims of last week's terror attacks in London, Britain on March 29, 2017. (Xinhua/Ray Tang)
Members of muslim community attend an event on Westminster Bridge to commemorate the victims of last week's terror attacks in London, Britain on March 29, 2017. (Xinhua/Ray Tang)