At least 130 civilians were killed by Burkina Faso government forces and allied militia in March near the western town of Solenzo, Human Rights Watch (HRW) says in a new report.
It says the "massacre", following an operation led by Burkinabè special forces, resulted in widespread civilian deaths and displacement of ethnic Fulanis.
The Fulani are a pastoralist, largely Muslim community who the government has often accused of backing Islamist militants - an allegation denied by community leaders.
About 40% of Burkina Faso is under the control of groups linked to al-Qaeda and Islamic State operating in West Africa's Sahel region.
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