Ethiopian Prime Minister Abiy Ahmed sent troops into Tigray last November to topple the Tigray People's Liberation Front (TPLF), a move he said came in response to rebel attacks on army camps.
Though the 2019 Nobel Peace laureate vowed a swift victory, by late June the TPLF had retaken most of Tigray before expanding into the Amhara and Afar regions.
The TPLF, which has not ruled out a possible march on the Ethiopian capital Addis Ababa, is demanding an end to what the UN describes as a de facto humanitarian blockade on Tigray, with no aid permitted to enter the region in the past month.
Griffiths said $25 million of the fresh cash injection was coming from the UN's Central Emergency Response Fund, while another $15 million was coming from the country-based Ethiopia Humanitarian Fund.
In Tigray, Amhara and Afar, the money will support aid agencies providing protection and other life-saving assistance to those affected by the conflict, the statement said.
"Women, boys and girls continue to bear the brunt of the conflict, yet their protection needs remain underfunded," it said.
In the drought-hit southern Somali and Oromia regions meanwhile, the additional cash will help relief agencies to provide drinking water, including to prevent waterborne diseases like cholera, and to support preserving livestock.
Despite the new injection of funds, the UN said humanitarian operations throughout Ethiopia were still facing a $1.3-billion funding gap this year, including $350 million still needed to respond to the crisis in Tigray alone.
