LAGOS, Nigeria (AP) — Scores of people died in central Nigeria during vicious weekend clashes between mostly Muslim herders and Christian farmers, with one report citing police saying 86 people were killed. By some accounts, the growing conflict over resources has become deadlier than Nigeria's Boko Haram extremist insurgency.

Nigeria's president accused unnamed politicians in a statement Monday of taking advantage of the chaos ahead of next year's elections, calling it "incredibly unfortunate."

Dramatic footage from Jos showed angry people waving machetes and sticks and shouting at passing security forces as they weaved around overturned and burning vehicles. Smoke rose in the distance. Women and children clutching overstuffed bags piled into the back of trucks, seeking a way out.

President Muhammadu Buhari warned against reprisal attacks after the "deeply unfortunate killings across a number of communities" in central Plateau State as the military, police and counterterror units were sent to end the bloodshed.

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"No efforts will be spared" to find the attackers, Buhari said.

Nigeria's government said "scores" were killed, but did not provide an official death toll. The independent Channels Television cited a Plateau State police spokesman, Mathias Tyopev, as saying 86 people had been killed and at least 50 houses destroyed.

Mass burials began Monday amid fears that the death toll was even higher.

"Please remain calm," said the Plateau State governor, Simon Bako Lalong, as a helicopter whirred overhead. "It is very, very, unfortunate that an incident is happening again like this."

The deadly clashes between herders and farmers are a growing security concern in Africa's most populous country, which is roughly split between Muslims in the north and Christians in the south.

The threat from Boko Haram, which continues to carry out attacks in the northeast, has been cited as a cause of the growing tensions. Herders in search of safe grazing land, and also feeling the effects of climate change, have been forced south into more populated farming communities.

The widespread security issues pose a major challenge to Buhari, a Muslim former military ruler who won office in a democratic transfer of power in 2015, as elections approach next year.

The latest clashes began when about 100 cattle were rustled and some herders were killed, the statement from Buhari's office said. "Less than 24 hours later, violence broke out. Some thugs then took advantage of the situation, turning it into an opportunity to extort the public, and to attack people from rival political parties."

Some people were dragged from their cars and attacked if they said they supported certain politicians, the statement said.

The Plateau State governor announced a 6 p.m. to 6 a.m. curfew in the communities of Jos South, Riyom and Barkin Ladi until further notice.

"Observe the curfew, observe the curfew, and I will still remind them to observe the curfew," he said.

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