London, November 26th 2014. A vigil for teenager Mike Brown who was shot dead by a policeman in Ferguson, Missouri this year, takes place outside the US embassy in London. Anti-racism and human rights campaigners called the &lsquo;emergency&rsquo; protest following a court verdict that clears Police Officer Darren Wilson of murder. PICTURED: Placards raised, the crowd chants &quot;No justice, no peace!&quot;.