On Monday, Ethiopia's Tigray forces said that the Ethiopian government conducted airstrikes on Mekelle, the regional capital.
Residents and aid workers in Tigray also claimed the bombing, but the Ethiopian government refuted the reports.
The United Nations said it was investigating the strikes' reports.
"We are deeply concerned about the potential impact on civilians," said Stephane Dujarric, a spokesman for the United Nations.
The US State Department's spokesperson, Ned Price, said the US was also investigating the alleged incident. "We, broadly speaking, do remain gravely concerned by what has been escalating violence in Tigray for some time," he said.
According to Agence France-Presse, at least three inpiduals were killed in Monday's airstrikes, according to a medical official in Mekelle.
According to witnesses in the area, one of the attacks occurred near a market. Because the location is cut off from the outside world, it was impossible to verify the accounts.
An Ethiopian government official, Legesse Tulu, denied that the government had attacked Mekelle.
Since June, when Tigray forces retook control of much of the province and Ethiopian forces left, Mekelle has been devoid of large-scale conflict. Following that, the fighting spilled over into the adjacent Amhara and Afar regions.
Tigray forces claimed last week that Ethiopian soldiers had initiated a ground attack to drive them out of Amhara.
For nearly a year, the Ethiopian federal government has been at odds with fighters from the northern Tigray region.
Last November, Ethiopian Prime Minister Abiy Ahmed dispatched troops to Tigray, citing attacks on federal army camps by forces loyal to the Tigray People's Liberation Front.
According to the United Nations, the war has killed thousands of people and left hundreds of thousands more at risk of starvation.
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