Spokesperson of Swiss Foreign Ministry, Noemie Charton, has confirmed his country took part in the negotiations that secured the release of 82 girls kidnapped at the weekend by the terror group Boko Haram.

He said the country took part “at the request of Nigeria” and due to “humanitarian concerns”.

Last Friday, a Boko Haram faction released the girls, who had been held captive for three years, in exchange for prisoners.

Those freed were part of a group of more than 276 schoolgirls kidnapped from the Chibok village, in the restive Borno State, in April 2014.

Nigeria thanked Switzerland, International Committee of the Red Cross (ICRC), as well as local and international NGOs for helping secure the release of the girls.

“Switzerland’s commitment is motivated by humanitarian concerns.

“Switzerland’s engagement in this operation was guided by the principles of strict neutrality and non-interference.”

Charton added that Switzerland also called for the release of the rest of the Chibok girls still held captive by the group.

At least 21 Chibok girls were released last October in another deal brokered by Switzerland and the Red Cross. It is believed 114 girls are still in Boko Haram custody.

“The process of negotiation with groups like Boko Haram is very complex and stressful and requires a varied number of actors working together and playing different, but key roles to realise the desired outcome,” security analyst and counter-terrorism expert David Otto told IBTimes UK.

“The Swiss representative played an active role in organising negotiations from within Nigeria and outside Nigeria along with local key actors like Zannah Mustapha and (human rights activist and lawyer) Aisiha Wakil who wield trust due to their pre-existing relationships with one or more factions,” he continued.

Details of the negotiations that resulted in the release of the girls have not been disclosed and little is known about the identity of the prisoners.

However, Otto – who said his company TGS Consulting was involved in negotiations – said the prisoners are “influential Boko Haram commanders”.

“Their roles have never been officially established except that Boko Haram required their release in exchange,” he said.

Ryan Cummings, director of political and security risk management consultancy, Signal Risk, told IBTimes UK: “It is difficult to speculate the impact that the release of the detained commanders would have on the operational capacity of the sect, given that we do not know the identities of the operatives released as a result of the hostage exchange.”

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