Over 200 schoolgirls were abducted from their school by extreme Islamist group Boko Haram over two months ago.
The group released a video showing 100 of the missing girls, but most of them remain in the hands of Boko Haram.
Two of the schoolgirls were reportedly found ‘barely alive’ and tied to a tree in the jungle.
Talks to free 50 of the schoolgirls fell apart due to ‘lack of trust’ between the government military and the terrorist group.
Chief of Defence Staff Air Marshal Mr Badeh told demonstrators on Monday that ‘the good news for the parents of the girls is that we know where they are.’
He refused to reveal the location, adding: ‘But where they are held, can we go there with force? We can't kill our girls in the name of trying to get them back.’
‘Nobody should come and say the Nigerian military does not know what it's doing… We know what we are doing.’
‘The president is solidly behind us. The president has empowered us to do the work.’
Earlier this month, US president Barack Obama revealed he had send troops to Nigeria to help the Nigerian military in the on-going search for the missing schoolgirls.