Abuju: Some of the Chibok schoolgirls abducted three years ago by Islamist Boko Haram militants refused to be part of a group of 82 girls freed at the weekend, a mediator involved in the release said on Monday.
Some parents did not live long enough to see their daughters released, underscoring the tragedy of the three-year saga.
Cummings says there is a counter-theory which claims that Chibok girls were treated differently to other kidnap victims "in view of how much of an asset they were to Boko Haram in terms of being a bargaining chip with the Nigerian government".
"We will help reunite the girls with their families and make sure they can continue their education in a safe environment".
But Obe said until the remaining 113 are freed, the minds of Nigerians will not be at rest, adding that all the girls should be accounted for and brought back alive.
It said ICRC vehicles were used to transport the freed girls to Nigerian officials at Banki, in Borno state.
There was no immediate comment about the exchange from the Nigerian presidency or Boko Haram, which has links to the Islamic State group.
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Photos released by the government on Sunday showed the president addressing the Chibok schoolgirls at his official residence.
The departure of Nigeria's president for more medical checkups in London is renewing fears for his health in Africa's most populous country.
The cause of his illness is unclear but a statement from his office said there was "no cause for worry" and that the length of his London stay would depend on advice from doctors. But it was the mass kidnapping of 276 girls in April 2014 that horrified the world and brought the extremist group worldwide attention. Girls who escaped said some of their classmates had died from illness. Others did not want to come home because they'd been radicalized by their captors, they said.
She said government should do its best to see that the 82 freed girls were given full rehabilitation so that they can be reintegrated into the society.
It is being reported that the girls were handed over on Saturday in exchange for five Boko Haram suspects after negotiations - a deal which has been criticised by the Peoples Democratic Party (PDP), led by Senator Ahmed Makarfi. And the recovery process is expected to be a long one for the girls. Its insurgency has killed more than 20,000 people and driven 2.6 million from their homes, with millions facing starvation.
"A lot of factors come into play when a nation has to decide whether or not to engage in prisoner/hostage swap".