HRW interviewed 17 people over the alleged killings, including 12 witnesses to the arrests and later burial of the victims, in Djibo, about 200 kilometres north of the capital Ouagadougou.
Thirty-one people – mostly Fulani herders – were apparently killed by Dogon hunters, a local official says. Nine soldiers were killed in a separate attack in central Gao region.
At least 456 people were killed in central Mali last year, and hundreds more were wounded, says Human Rights Watch.
Assailants strike two ethnic Dogon villages of Yoro and Gangafani 2, a local mayor says, a week after some 100 villagers were killed in Sobane-Kou village, part of ethnic reprisal attacks plaguing central Mali.
The Malian prime minister resigned along with his entire government, after criticism over failure to clamp down on deadly violence.
Attackers dressed as traditional Dogon hunters targeted Fulani herders in the villages of Ogossagou and Welingara in Mopti region, officials say.
Senegal President Macky Sall comfortably won another term in office in last Sunday's election, provisional figures showed on Thursday, giving him five more years to finish a raft of modernising projects.
The government says the attackers, who were dressed as traditional Donzo hunters, raided the village of Koulogon in the central Mopti region and that some of the victims were children.
Conflict between farmers and semi-nomadic herders across the African country since 2016 resulted in the killing of at least 3,641 people, Amnesty International says in a report.
Several dozen civilians have been shot dead by gunmen who raided homes in northeastern Mali near the border with Niger, local officials said.
The violence earlier this week between the Berom, indigenous farmers, and the Fulani, nomadic cattle herders, took place in Jol, a community part of the Riyom local government area of Plateau state, said military spokesman Major Adam Umar.
With 1,300 dead, the clash between farmers and semi-nomadic herders, mainly from the Fulani ethnic group, have displaced tens of thousands and schools have turned into migrant camps.
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