The leader of rebellious forces in Tigray region said on Saturday that Ethiopian government forces had began an offensive to capture the regional capital, Mekelle.
Debretsion Gebremichael, leader of the Tigray People's Liberation Front (TPLF) told Reuters in a text message Mekelle was under "heavy bombardment".
Billene Seyoum, a spokeswoman for the Prime Minister's office, said that Ethiopian forces would not "bombard" civilian areas, adding "the safety of Ethiopians in Mekelle and Tigray region continues as priority for the federal government."
Debretsion also accused the military of the neighbouring nation of Eritrea of raiding refugee camps in Tigray to capture refugees who had fled Eritrea.
Reuters was not immediately able to get comment from the Eritrean government.
Claims from all sides are difficult to verify since phone and internet links to the region have been down and access tightly controlled since fighting began three weeks ago between forces of the government and the TPLF.
Qatar's prime minister said on Sunday that efforts to reach a new ceasefire in Gaza have made some progress but an agreement between Israel and Hamas to end the war remains elusive.
A huge blast most likely caused by the explosion of chemical materials killed at least 18 people and injured more than 700 on Saturday at Iran's biggest port, Bandar Abbas, Iranian state media reported.
The UN Refugee Agency (UNHCR) and the UN Office for the Coordination of Humanitarian Affairs (OCHA) have sounded the alarm over severe funding shortfalls that are hindering life-saving humanitarian aid in countries including Nigeria, Burundi, and Colombia.
A number of people were killed and multiple others were injured in Vancouver after a vehicle drove into a crowd at a Filipino street festival in the western Canadian city, police said on Saturday.