Boko Haram's Islamist insurgency has devastated northeast Nigeria since it began in 2009, and the violence has spread to neighboring countries, including northern Cameroon.
A new Amnesty International report has accused security forces of torturing hundreds of people in Cameroon accused of supporting Boko Haram, often without evidence.
Tine condemned the "horrific violations" by the Cameroon forces which amount to "war crimes".
"They asked me to tell them if I knew members of Boko Haram - that's when the guard tied my hands and feet behind my back and started to beat me with an electric cable, while throwing water on me at the same time", Samou, who was arrested in March 2016, told Amnesty.
The majority of victims were men aged between 18 and 45 and from the Far North region, which has been repeatedly attacked by suicide and bomb attacks. In one common stress position, described by detainees as "the goat", their limbs were tied together behind their back before they were beaten.
In a statement issued by the media manager of Amnesty International Nigeria, Isa Sanusi, Alioune Tine said: "Victims described at least 24 torture methods they were subjected to".
Last year, more than 100 people were sentenced to death by a military court, while three students were jailed for 10 years for sharing a joke about Boko Haram by text message.
"In the very near future, we hope that children who learn by radio will also receive a certification and pass the school year", said Marie-Pierre Poirier, UNICEF's regional director.
Des policiers frappés à grands coups de Tour Eiffel miniatures — Paris
Le vendeur, un sans-papiers âgé de 19 ans, selon le Parisien , a été placé en garde à vue au commissariat du 16e arrondissement. Rattrapé, il s'est emparé de sa marchandise - un "cerceau" de miniatures de la Dame de Fer - pour frapper les policiers.
The report - "Cameroon's secret torture chambers: human rights violations and war crimes in the fight against Boko Haram" - documents 101 cases of incommunicado detention and torture between 2013 and 2017, at over 20 different sites.
France, the former colonial power in Cameroon, runs its counter-terrorism operations against jihadist groups in the Sahel region from the Chadian capital, N'Djamena.
"They beat me half to death", he added.
"Given the frequent and possibly prolonged presence of their military personnel, the U.S. government and other worldwide partners should investigate the degree to which their personnel were aware of illegal detention and torture at the Salak base, and whether they took any measures to report it to their superiors and the Cameroonian authorities", said O'Gorman.
The U.S. ambassador to Yaounde, Michael S. Hoza, wrote in response that it took seriously any allegation of human rights abuses by Cameroonian security forces.
The report also highlighted the presence of USA and French military personnel at the BIR base in Salak and called on the governments to investigate the extent to which their personnel might have been aware that illegal detention and torture was taking place on the site.
"Any foreign military unit that receives security assistance receives training on the law of armed conflict and human rights law".
Amnesty said they had received no immediate response from the French embassy.
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