Residents of a district in Ethiopia’s Amhara region that government forces have recently retaken have accused fighters from the Tigray region of mistreatment, including extrajudicial killings.
Tigrayan forces occupied the Raya Kobo district for five weeks.
Residents told the BBC that people suspected of belonging to a pro-government militia were targeted.
All sides of the conflict in northern Ethiopia have previously been accused of violating international human rights.
A joint investigation done last year by the Ethiopian Human Rights Commission (EHRC) and the UN Human Rights Office said there could also be evidence of war crimes.
Extra-judicial executions, torture, rape, and attacks against refugees and displaced people were documented.