At least 60 people were killed and 40 others wounded after Ethiopia’s air force bombed a market in the northern region of Tigray.
The Ethiopian air force struck the town of Togoga on Tuesday, 25km from the region’s capital, Mekelle.
The Ethiopian military denied targeting civilians, saying it carried out the strikes to neutralise “terrorists”.
There are fears that the toll of the dead and injured will increase further.
Tigrayan rebel forces are said to have made advances in recent days.
The International Committee of the Red Cross (ICRC) said it helped evacuate the wounded.
Meanwhile, the UN called on Ethiopia to investigate the reported air strike.
Thousands of people have been killed and millions displaced after conflict erupted almost eight months ago.
TIGRAY WAR BACKSTORY
Ethiopia’s government, aided by troops from neighbouring Eritrea, launched an offensive in November 2020 to oust the region’s then ruling party, the Tigray People’s Liberation Front (TPLF). By the end of the month, it declared victory.
The TPLF had a massive falling-out with Prime Minister Abiy Ahmed over his political reforms, though its capture of federal military bases in Tigray was the catalyst for the invasion.
The TPLF has since joined forces with other groups in the region to form the Tigray Defence Force (TDF) rebel group.