The Ethiopian government said on Monday it had not asked any country to mediate in a conflict in its northern region as the federal air force bombed the Tigrayan capital Mekelle, according to diplomatic and military sources.
Uganda's president Yoweri Museveni had tweeted a call for the conflict to stop. Mr Museveni's tweet would later be deleted.
Kenya and Djibouti urged a peaceful resolution and the opening of humanitarian corridors while former Nigerian leader Olusegun Obasanjo went to Ethiopia.
Ethiopian Prime Minister Abiy Ahmed announced Tuesday that the ongoing military operation in the breakaway region of Tigray (North) will enter its "final" phase in the "coming days".
On November 4, Abiy sent the federal army to attack the northern region after months of tensions with the regional authorities of the Tigray People's Liberation Front (TPLF).
The fighting has left several hundred people dead, according to Addis Ababa, and has forced more than 25,000 people to flee to neighboring Sudan.