The announcement comes a day after the Ethiopian government declared a surprise truce to enable humanitarian access to Tigray and "pave the way for the resolution of the conflict" in the north of the country.
The Ethiopian Human Rights Commission has catalogued a litany of abuses, including torture, gang rape and enforced disappearances, saying some may amount to war crimes.
The hospital in the town of Shire where victims were taken reported at least 55 people dead and 126 injured, according to an official in Tigray's capital Mekele.
Tigrayan rebels fighting the central government are withdrawing from neighbouring regions in northern Ethiopia, a step towards a possible ceasefire after 13 months of a brutal war.
Ethiopian forces have reportedly taken back towns near Addis Ababa, including Shewa Robit, which were captures by the rebels last week.
Ethiopian forces and Tigrayan rebels are battling fiercely for the control of Kombolcha after rebels claimed they captured the town.
PM Abiy Ahmed calls on citizens to join fight against resurgent Tigrayan forces now pushing beyond their own northern region in nine-month war that has sparked a major refugee crisis.
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