Protesters hold placards and British Union Jack flags during a protest titled 'London march against terrorism' in response to the March 22 Westminster terror attack on April 1, 2017 in London, England. The march has been organised by far-right groups English Defence League and Britain First, which also sees a counter-protest held by group 'Unite Against Fascism'. During the terror attack in Westminster, Khalid Masood killed 4 people as he drove a car into pedestrians over Westminster Bridge and stabbed PC Keith Palmer to death before being shot dead himself. (Photo by Jay Shaw Baker/NurPhoto)