The United Nations says it and Ethiopia's government have signed a deal to allow ``unimpeded'' humanitarian access to the embattled Tigray region, at least the parts under federal government control. This will allow the first aid to the region of 6 million people that has been cut off during fighting that began a month ago between the federal and Tigray regional governments. Each regards the other as illegal in a power struggle that has been months in the making. For weeks, the U.N. and others have pleaded for aid access amid reports of food, medicines and other supplies running out. A U.N. humanitarian spokesman says the first mission to carry out a needs assessment begins Wednesday.