YAOUNDE, Dec. 27 (Xinhua) -- More than 100 suspected Nigerian Islamic sect Boko Haram militants were killed and over 200 arrested during an operation conducted by Cameroonian army on Friday night in Far-North Region of Cameroon, an army source told Xinhua over phone Saturday.

The operation took place in Doble, a place in Far-North Region bordering Nigeria, and was conducted by Cameroon Air Force and Rapid Intervention Battalion, an elite army unit stationing in the north.

During the operation, three Cameroonian air force pilots were seriously injured, the source said.

In the same night, 23 Cameroonian civilians were killed and a village was burned by suspected Boko Haram militants in Mozogo, a place in Far-North Region.

The suspected Boko Haram militants are active in the north of Cameroon, they often attack the villages in the area, pillaging properties of the villagers and sometimes taking foreign and local people as hostages.

The Cameroonian government has strengthened the military might this year by sending more troops in the north to fight against the militants.