The military says Nigerian troops have rescued 25 more children and women from Boko Haram as they continued to attack and destroy the extremists' camps in a forest stronghold.

Army spokesman Col. Sani Usman says many militants were killed in firefights Wednesday morning that also cost the life of one soldier. He says five troops were wounded.

About 700 children and women have been saved in the past week as soldiers supported by air raids have deployed on foot into the Sambisa Forest, the last stronghold of Nigeria's home-grown Islamic extremists.

It is unclear if those rescued include some of the schoolgirls kidnapped a year ago from Chibok town. Some 219 remain missing.