Cameroon’s army killed 92 members of Islamist militant group Boko Haram and freed 850 villagers in a joint operation with Nigerian forces, the government of Cameroon said on Friday.

The operation in the Nigerian village of Kumshe, close to the border with Cameroon, was conducted under the auspices of a multinational force fighting Boko Haram, the statement from Communications Minister Issa Tchiroma Bakary said.

“Two Cameroonian soldiers were killed (during the operation) by an accidental mine explosion. Five other soldiers were wounded,” Bakary said, adding that the army captured weapons and ammunition and found a centre for production of homemade mines.

Spokesman of the Nigerian army, Colonel Sani Usman confirmed the operation. He however did not give a toll of Boko Haram militants killed.

Usman said on Feb. 23, troops of 21 Brigade in conjunction with troops of MNJTF on clearance operations at Kumshe general area rescued 250 persons, mainly women and children.

Boko Haram seeking to carve out an emirate in northeastern Nigeria, has staged a campaign of suicide and other attacks in Cameroon, Chad and Niger over the past year, including killing as many as 1,000 in Cameroon.

The U.S. military calls Boko Harm the most violent extremist group in the world. The group gained global notoriety for kidnapping more than 200 schoolgirls in Nigeria in 2014 and is thought to have killed over 15,000 people over six years.