Ethiopia's military launched new air strikes on Tigray Wednesday, the second round of bombardments this week against rebel targets in the war-battered region.
The raids mark a sharp escalation in the brutal year-long conflict pitting government forces and their allies against the Tigray People's Liberation Front, the region's once dominant ruling party.
The international community has voiced alarm about the new attacks in the north, where fighting since November has killed thousands of people and left millions in need of emergency aid, AFP reported.
The government said it bombed TPLF weapons caches in the regional capital Mekele and the town of Agbe which lies about 80 kilometres (50 miles) to the west, after two raids on Mekele on Monday.
"It targeted at the facilities that TPLF have turned into arms construction and repair armaments sites," government spokesman Legesse Tulu said of the latest Mekele strike.
Dr Hayelom Kebede, research director at Mekele's Ayder Referral Hospital, said eight people had been wounded, including a pregnant woman.
UN spokesman Farhan Haq told reporters that initial information indicated some civilians including women and children were injured.
"It was heavy and the jet was so close," one local resident told AFP, with witnesses reporting thick clouds of smoke rising up over the city.
The United States, which has threatened sanctions if the warring parties do not reach a negotiated settlement, issued a strong statement denouncing the violence.
"We have seen the credible reports of attacks in and around Mekele. The United States condemns the continuing escalation of violence, putting civilians in harm's way," State Department spokesman Ned Price tweeted.
The conflict has created a deep humanitarian crisis with the United Nations saying around two million people have been displaced and hundreds of thousands plunged into famine-like conditions.
Prime Minister Abiy Ahmed's government, barely two weeks into its new term, seems to be waging a new offensive against the TPLF, which dominated national politics for almost three decades before he took power in 2018.
William Davison, the International Crisis Group's senior analyst for Ethiopia, said the strikes "appear to be part of efforts to weaken Tigray's armed resistance," as the TPLF makes gains in the neighboring Amhara region.
"Along with superior manpower, control of the skies is one of the few remaining areas of military advantage for the federal government."
TPLF spokesman Getachew Reda said Wednesday's raid on Mekele hit a residential area "causing injury to civilians and harm to property".
"Abiy's reaction to his losses in the ongoing fighting is to target civilians hundreds of kms away from the battlefield," he said on Twitter.
He later claimed TPLF fighters had taken control of at least two towns in Amhara, putting the cities of Kombolcha and nearby Dessie -- where tens of thousands have sought refuge from the rebel advance since July -- "within artillery range".
Much of northern Ethiopia is under a communications blackout and access for journalists is restricted, making battlefield claims difficult to independently verify.
Tigray remains under a de facto blockade, with the warring parties each accusing the other of hampering the delivery of desperately needed aid.
Legesse, the government spokesman, charged that the TPLF was using ordinary people as human shields.
"We confirm and assure these surgical operations have not any intended harm to civilians," he said.
On Monday, there were two aerial assaults in and around Mekele, the city held by the TPLF since it was recaptured from government forces in June.
The United Nations said those attacks had killed three children and wounded nine people.