DAKAR — The death toll from Saturday's attack by unknown gunmen on villagers in central Mali has risen to 157, a government spokesman said on Tuesday, confirming it as one of the worst recent atrocities in a country beset by ethnic violence.

The attack took place as a U.N. Security Council mission was visiting the West African gold-producing country to seek solutions to violence that has killed hundreds of civilians last year and is spreading across West Africa's Sahel region.

A soldier walks amid the damage after an attack by gunmen on Fulani herders on Monday. Reuters

An official from a nearby town said on Saturday that armed men, dressed as traditional Donzo hunters, attacked villages populated by rival Fulani herders, many of whom they suspect of harboring Islamist extremists — charges the Fulani deny.

The attack came less than a week after a deadly assault by jihadists on an army post killed at least 23 soldiers, also in Mali's central region. That attack was claimed by an al Qaeda affiliate.

"The official death toll is 157," said government spokesman Amadou Kotia. Officials on Saturday said that about 134 had been killed, though they expected that number to rise.

Jihadist groups linked to al Qaeda and Islamic State have exploited ethnic rivalries such as those between Fulani and Donzo in Mali and its neighbors Burkina Faso and Niger in recent years to boost recruitment and render vast swathes of territory virtually ungovernable.

French forces intervened in Mali, a former French colony, in 2013 to push back a jihadist advance from the desert north but the militants have since regrouped and expanded their presence into central Mali and the neighboring countries.

Some 4,500 French troops remain based in the wider Sahel, most of them in Mali. The United States also has hundreds of troops in the region.