Government spokesman Legesse Tulu told reporters that the prime minister arrived at the front on Tuesday, but he didn't give details on the location. Deputy Prime Minister Demeke Mekonnen is handling day-to-day government activities, Legesse said.

The war in Africa's second-most populous nation has killed an estimated tens of thousands of people, and countries including France, Germany, and Turkey have told their citizens to leave immediately as rival fighters from Ethiopia's northern Tigray region advance on the capital, Addis Ababa.

A US envoy on Tuesday told reporters he fears that ``nascent'' progress in mediation efforts with the warring sides could be outpaced by the ``alarming'' military developments.