The latest strike was aimed at a facility "currently serving TPLF for military training", government spokesman Legesse Tulu told AFP, referring to the Tigray People's Liberation Front rebel group.

However it was unclear if the strike was successful, with TPLF spokesman Getachew Reda telling AFP the group's air defence units managed "to foil its mission".

"I can see it's trying a third time and we will see what will happen," he said.

Prime Minister Abiy Ahmed's government has been locked in a nearly year-long war against the TPLF, though Tigray itself has seen little combat since late June, when the rebels seized control of much of Ethiopia's northernmost region and the military largely withdrew.

But on Monday Ethiopia's air force launched two strikes in Tigray's capital Mekele that the UN said killed three children and wounded several other people.

And on Wednesday it bombed TPLF weapons caches in Mekele and in the town of Agbe, which lies about 80 kilometres (50 miles) to the west.

A hospital official told AFP that Wednesday's strike in Mekele injured at least eight people, including a pregnant woman.

There was no immediate word on casualties from Thursday's strike.

The international community has voiced alarm about the latest attacks, which the TPLF claims show a disregard for civilian lives.