The body of Edward Burns, 36, - who was shot in the head - was found near Falls Road and the beaten body of Joe Jones, 38, was discovered in Ardoyne. Irish police said that three men and a woman had been arrested by detectives in Dublin and Dundalk on Sunday. The Police Service of Northern Ireland said three men and a woman were being questioned in Antrim over the killings. Police said the killings took place against the backdrop of tension within dissident republicanism.