(UN News Centre) – Concluding a three-day mission to Yemen, the United Nations Emergency Relief Coordinator today called on all warring parties to grant humanitarian access and uphold their responsibilities to protect civilians in a conflict that has injured and killed thousands of innocent civilians, and displaced some three million people. “The best humanitarian relief that can be provided is an end to the conflict. I urged the authorities, as I urge other parties to the conflict, to return to political negotiations without delay to reach a negotiated solution,” Stephen O’Brien, who is also the UN Under-Secretary-General for Humanitarian Affairs, said in Sana’a, the Yemeni capital.