The detectives investigating the murder of a young boy whose torso was found floating in the Thames today arrested 21 suspected people smugglers who may be linked to his death.

Police believe that the unknown victim - who they have named Adam - had been mutilated in a ritualistic sacrifice linked to ancient fertility rites, possibly by the African black magic "muti" cult. This type of witchcraft is prevalent in sub-Saharan Africa, where Adam is thought to be from.