The United Nations is endeavouring to get a team on the ground to investigate alleged human rights infringement, including a mass killing in Ethiopia’s Tigray, described by the UN rights chief as one of many “appalling" human rights cases of abuse that could amount to war crimes. Ethiopia’s army has been fighting rebellious forces in the northern Tigray region for more than six weeks in a conflict that has displaced close to 950,000 people. Access for humanitarian workers has until recent days been impossible and rights workers are now seeking access...