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Widespread abuses against civilians in the western part of Ethiopia's embattled region amount to war crimes and crimes against humanity, and have charged in a new report.

The crimes were perpetrated by security officials and civilian authorities from the neighbouring region, sometimes "with the acquiescence and possible participation of Ethiopian federal forces," the rights groups say in the report released on Wednesday.

The abuses are “part of a widespread and systematic attack against the Tigrayan civilian population that amount to crimes against humanity as well as war crimes," the report says.

Ethiopian federal authorities strongly refute allegations they have deliberately targeted Tigrayans for violent attacks. They said at the outbreak of the war in November��2020 that their objective was to disarm the rebellious leaders of Tigray.

Ethiopian officials in , the federal capital, and in Amhara didn't respond to requests for comment on the allegations in the rights groups' report.

The report, the result of a months-long investigation including more than 400 interviews, charges that hundreds of thousands of Tigrayans have been forced to leave their homes in a violent campaign of unlawful killings, sexual assaults, mass arbitrary detentions, livestock pillaging, and the denial of humanitarian assistance.

Widespread atrocities have been reported in the Tigray war, with Ethiopian government troops and their allies, including troops from neighboring Eritrea, facing most of the charges.

Fighters loyal to the party of Tigray's leaders —, or TPLF — also have been accused of committing abuses as the war spread into neighboring regions.

The report by Human Rights Watch and Amnesty International describes the attacks in western Tigray as “ethnic cleansing,” a term that refers to forcing a population from a region through expulsions and other violence, often including

Publicly displayed signs in several towns across western Tigray urged Tigrayans to leave, and local officials in meetings discussed plans to remove Tigrayans, according to the report.

Pamphlets appeared to give Tigrayans urgent ultimatums to leave or be killed, the report says.

“They kept saying every night, ‘We will kill you … Go out of the area,’” said one woman from the town of Baeker, speaking of threats she faced from an Amhara militia group, according to the report.

Western Tigray has long been contested territory. Amhara authorities say the area was under their control until the 1990s when the TPLF-led federal government redrew internal boundaries that put the territory within Tigray's borders. Amhara officials moved swiftly to take over the region when the war broke out.

The outbreak of the war “brought these longstanding and unaddressed grievances to the fore: Amhara regional forces, along with Ethiopian federal forces, seized these territories and displaced Tigrayan civilians in a brutal ethnic cleansing campaign,” the report says.

US��Secretary of State asserted in March 2021 that ethnic cleansing had taken place in western Tigray, marking the first time a top official in the international community openly described the situation as such. That allegation was dismissed by Ethiopian authorities as “a completely unfounded and spurious verdict against the Ethiopian government”.

The new report corroborates reporting by The Associated Press on atrocities in the war, which affects 6 million people in Tigray alone.��

In June, Ethiopia’s government cut off almost all access to food aid, medical supplies, cash and fuel in Tigray. The war has spilled into Amhara and Afar regions, with Tigrayan leaders saying they are fighting to ease the blockade and to protect themselves from further attacks.

Facing growing international pressure, Ethiopian authorities on March 24 announced a saying the action was necessary to allow unimpeded relief supplies into the area. Trucks bearing food supplies have since arrived in the region.

The AP last year confirmed the first starvation deaths under the blockade along with the government’s ban on humanitarian workers bringing medicines into Tigray.

Estimated tens of thousands of people have been killed in the war. But there is little hope for peace talks as Ethiopian authorities have outlawed the TPLF, effectively making its leaders fugitives on the run.

Among their recommendations, the rights groups call for a “neutral protection force" in western Tigray, possibly with the deployment of an African Union-backed peacekeeping mission, “with a robust civilian protection mandate”.

Their report also urges the to impose an arms embargo targeting all the warring parties.