ADDIS ABABA: Clashes between federal and Tigrayan forces have erupted in Ethiopia's northern Tigray region, prompting the suspension of flights, security and diplomatic sources told AFP on Thursday.

The renewed tensions risk a return to conflict in the volatile region, which around three years ago emerged from a brutal war between Ethiopian federal forces and the Tigray People's Liberation Front (TPLF) that killed at least 600,000 people between November 2020 and November 2022, according to the African Union -- a toll some experts say is understated.

Hostilities broke out in recent days in Tsemlet, western Tigray, an area claimed by forces from the neighbouring Amhara region who have refused to withdraw despite a peace agreement signed in Pretoria at the end of 2022 requiring them to do so.

"The situation appears to be deteriorating," the security source said.

A diplomatic source who spoke on condition of anonymity told AFP that the Tigray forces were facing "the ENDF (Ethiopian army) alongside Amhara militias".