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.


Iran says it is reviewing US proposal to end war
UN Human Rights Council adopts resolution condemning Iranian attacks
Russian attacks kill two in Ukraine's Kharkiv
Kuwait foils terror plot targeting state leaders
Iran rejects Trump's talk of negotiation as Israel and Iran launch airstrikes
Cyprus has opened discussion with UK over its bases, president says
Netanyahu seeks to avoid snap vote as Iran war gives no boost in polls
Luxury Paris hotel near Elysee reopens after fire forces brief closure
