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The Nigerian military say they know where the girls kidnapped by Boko Haram are but they will not attempt a rescue, the BBC reported. 

Nigeria's Chief of Defence Staff said it was "good news for the parents," although he admitted the military would not risk "going there with force."

More than 200 girls were abducted by Boko Haram gunmen from their school in northern Nigeria in April.

Earlier, the BBC learned that a deal to release some of the girls was close but was called off by the government.

The BBC's Will Ross in Abuja says an intermediary met leaders of the Islamist group and visited the place where they were being held.

He says agreement was almost reached to release 50 of the girls in exchange for the release of 100 Boko Haram prisoners.

But the Nigerian government pulled out of the deal after President Goodluck Jonathan attended a conference on the crisis in Paris. The reasons for the withdrawal are unclear.

Nigeria's government is under pressure to do more to tackle the group and bring about the girls' release.

Thousands of people have died since Boko Haram began a violent campaign against the Nigerian government in 2009 and in the subsequent security crackdown.