The United Nations aid chief Martin Griffith said Wednesday he was working on obtaining commitments from warring parties in Sudan to protect humanitarian assistance and to ensure it can be delivered to those in need. "We will still require agreements and arrangements to allow for movement of staff and supplies," he told reporters via video link from Port Sudan. "We will need to have agreement at the highest level and very publicly and we will need to deliver those commitments into local arrangements that can be depended on."