Stock Photo - Aug. 08, 1957 - Murdered boy's uncle hunts friends to prove his alibi: Colin Warren - the man who says 'I am suspect No. 1 in the hunt for the murderer of my nephew Alan' - went into the half-world of Soho and the East End last night. He looked for George, the man in the shocking-pink sweater. He looked for Arthur, from the Army Catering corps. He locked in the basement clubs for the men and women he said he was with on Saturday night. This was the night that seven-year-old Allan Warren was savaged and murdered at Loughton, Essex, in one of the most brutal child killings, Essex in one of the most brutal child killings in criminal history. during his search Mr. Warren was accompanied by Murder Squad detectives. Photo shows Colin Warren pictured during his search round soho last night. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)