GENEVA - The top United Nations human rights body agreed on Friday to boost its investigation into widespread violations in North Korea with a view to documenting alleged crimes against humanity for future prosecution. The 47-member state Geneva forum adopted a resolution, brought by Japan and the European Union (EU) and backed by the United States, on the final day of its four-week session without a vote. North Korea's delegation boycotted the debate. The UN human rights office in Seoul will be strengthened for two years to establish a central repository for testimony and evidence 'with a view to developing possible strategies to be used in any future accountability process,' the text said. China said it 'dissociated' itself from the decision and called for dialog and a 'focus on the bigger picture' to help de-escalate tensions on the divided Korean peninsula.