The Eritreans crossed the border into northern Ethiopia soon after Mr. Abiy launched a military campaign in Tigray on Nov. 4, accusing rebellious Tigrayan leaders of orchestrating an attack on a major military base and trying to topple the federal government.
As the fighting gathered pace, reports of gross abuses against civilians began to emerge from Tigray. Ethiopian soldiers, allied fighters from ethnic Ahmara militias, and fighters loyal to the Tigray People’s Liberation Front all faced accusations.
But United Nations officials and human rights groups singled out Eritrean troops for many of the worst violations. Last weekend, Mr. Abiy spent five hours in talks with U.S. Senator Chris Coons, who had been sent to Ethiopia by President Biden to convey his alarm at the deteriorating situation.
In a briefing to reporters on Thursday, Mr. Coons said that the talks were “forthright” at times, and that Mr. Abiy had reiterated his promise to investigate human rights abuses in Tigray, including “credible reports of sexual violence as a tool of war.”
But Mr. Abiy has fallen short on such commitments before, Mr. Coons said, and the United States intends to keep up the pressure.
“It’s actions that are going to matter,” he said.
On Friday a State Department spokeswoman welcomed Ethiopia’s announcement, calling it “an important step” toward de-escalation.
In a mark of the impunity that has come to characterize the Tigrayan conflict, Ethiopian soldiers dragged civilians from a bus on a major road in Tigray and executed four of them in front of aid workers from Doctors Without Borders, the group said in a statement Thursday.