The United Nations said on Friday that fighting continued “in many parts” of Ethiopia’s Tigray, complicating efforts to deliver humanitarian aid despite a deal granting the UN access to territory under federal control.

Prime Minister Abiy Ahmed announced military operations in the northern region a month ago, saying they targeted the leaders of its ruling party, the Tigray People’s Liberation Front (TPLF).

Last week he declared victory, saying fighting was “completed” after federal forces entered the regional capital Mekele. But the TPLF has vowed to fight on.