Ethiopia's military has defeated local forces in the west of Tigray state, Prime Minister Abiy Ahmed said yesterday, accusing his foes of atrocities during a week of fighting that threatens to destabilise the Horn of Africa. 

Air strikes and ground combat have killed hundreds, sent refugees flooding into Sudan, stirred Ethiopia's ethnic divisions and raised questions over the credentials of Abiy, Africa's youngest leader who won a Nobel Peace Prize in 2019.

"The western region of Tigray has been liberated," tweeted Abiy, 44, who comes from the largest ethnic group the Oromo and once fought with the Tigrayans against neighbouring Eritrea.

"The army is now providing humanitarian assistance and services. It is also feeding the people," he added.

The Tigray People's Liberation Front (TPLF), which rules the mountainous northern state of more than 5 million people, announced a local state of emergency against what it termed an "invasion by outsiders".

Abiy accuses the TPLF of starting the conflict by attacking a federal military base and defying his authority, while the Tigrayans say his two-year rule has persecuted them.

More than 10,000 Ethiopian refugees have crossed into Sudan since fighting started and aid agencies say the situation in Tigray is becoming dire. Even before the conflict, 600,000 people there were reliant on food aid.