File photo shows Nigerian soldiers participate in an operation in Nigeria's northeastern state of Borno, March 16, 2016. (Xinhua/Wale Salau)

LAGOS, July 4 (Xinhua) -- About 700 Boko Haram insurgents in the restive Borno state have surrendered to Nigerian troops, the Nigerian army said Monday.

Chief of Army Staff Tukur Buratai said during an exhibition to mark the week-long Nigerian Army Day Celebration that Nigerian troops had made "tremendous achievement" in the counter insurgency operations.

"Some others are in the process to surrender, This is a clear indication that the Boko Haram war is clearly being won," he said.

He said it would be a great sigh of relief as the terrorists are finally capitulating.

Boko Haram has been blamed for the deaths of more than 20,000 people and displacing of 2.3 million others in Nigeria since their insurgency started in 2009.

The group kidnapped more than 200 school girls in Chibok, a community in Borno State, in April 2014. So far, 106 of the abducted schoolgirls have been rescued.

At least 1,400 suspected members of Boko Haram are currently held in a detention center in the country's northeast region.