Reuters said the mercenaries announced on Friday in a newspaper affiliated with them that they disclosed the record of killing and wounding 69 members of the Nigerian army and African forces charged with fighting terrorists in attacks over the past week.
The attacks took place at a military barracks, a military post and a town in the northeastern state of Borno and the Lake Chad region.
The West African state mercenaries, which split from the Boko Haram group based in Nigeria in 2016, said they destroyed an African Union tank on Saturday near the town of Tumir in Niger and killed all the soldiers on board without specifying a number, Reuters said.
In a related context, Daesh on Thursday claimed responsibility for its first attack in the Democratic Republic of the Congo and declared it as a "Central African state," after the killing of two soldiers and a civilian in an exchange of fire.
A source at the United Nations peacekeeping mission and a civil society leader told Reuters 3 have lost their lives in clashes on Tuesday in the town of Bovata.
More than 12 militia and criminal groups are active in the eastern Democratic Republic of the Congo.