Amnesty International accuse Cameroonian security forces for unlawfully killing dozens of civilians, torturing others and accountable for forced disappearances of others in mass arrests of suspects in the fight against the Boko Haram Islamic sect.
A report published Thursday accuses forces operating in Cameroon's Far North region, bordering north-east Nigeria, of crimes under international law.
The London-based group says Cameroon's government and security chiefs have not responded to its requests for information about the allegations and missing people and its calls for investigations.
The Associated Press has quoted refugees who fled across the border into Nigeria as saying that Cameroonian troops were indiscriminately killing civilians and looting and destroying property.
Amnesty says it interviewed more than 160 people including victims, witnesses and a senior military officer during three trips to Cameroon in 2015.