Nigerian soldiers participate in an operation in Nigeria's northeastern state of Borno, March 16, 2016. Nigerian soldiers on Wednesday participated in an operation of destroying Boko Haram terrorists camps at Bulasari area of Borno State. Nigerian troops recovered armored carrier from the terrorists. (Xinhua/Wale Salau)

ABUJA, Feb. 2 (Xinhua) -- The Nigerian Army said Thursday its troops had cleared more camps of terror group Boko Haram in the country's northeastern state of Borno as part of the ongoing mop-up operations.

A statement by Nigerian Army spokesman Sani Usman said the troops cleared three major camps of Boko Haram in three locations across the state on Wednesday.

According to Usman, the Nigerian troops killed six terrorists and injured several others, while three Nigerian soldiers died in the operations.

He noted the troops made an unprecedented recovery of arms and ammunition during the anti-terror operations, recovering, among others, rocket-propelled grenade tubes and bombs, an anti-aircraft gun barrel and nine AK-47 rifles.

Nigeria has made a considerable gain on the Boko Haram front, with its security forces operating in the restive region dislodging the Boko Haram fighters from the Sambisa Forest, the group's largest training camp in the country, last month.

The security forces are intensifying aerial and ground patrol in the country's northeast, extending their offensive mission around the Green Belt Region near Niger and Chad.

Boko Haram has killed more than 20,000 people and displaced 2.3 million others since their insurgency started in 2009.