Alfie Swain (R) weeps while accompanied his girlfriend Paige Hamshere as they view flowers left in memory of his outside an army barracks near the scene of a killing in Woolwich, southeast London May 23, 2013. British authorities believe that two men accused of hacking a soldier to death on a London street in revenge for wars in Muslim countries are British of Nigerian descent, a source close to the investigation said Thursday. [Photo/Agencies]