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.
Israeli Prime Minister Benjamin Netanyahu prepared to leave Israel on Sunday for a meeting with US President Donald Trump, looking to strengthen ties with Washington after tensions with the previous White House administration over the war in Gaza.
Syria's interim president Ahmed al-Sharaa headed to Saudi Arabia on Sunday for his first international visit since the toppling of Bashar al-Assad, his office said.
Mexican President Claudia Sheinbaum on Saturday ordered retaliatory tariffs in response to the US decision to slap 25 per cent tariffs on all goods coming from Mexico, as a trade war broke out between the two neighbours.
Arab foreign ministers rejected the transfer of Palestinians from their land under any circumstances, presenting a unified stance against US President Donald Trump's call for Egypt and Jordan to take in residents of the Gaza Strip.