In a statement marking International Day in Support of Victims of Torture, Amnesty said it continued to receive regular reports of torture and other human rights abuses in military and police custody.
Unite released a statement on Tuesday night, saying Amnesty is already understaffed because only 670 of the 740 positions required are filled.
The international human rights organisation said more than 2,000 were killed in 2018 alone, while the bloodshed had made thousands of other people homeless.
Amnesty International told Reuters that the victims died across several towns in the two Anglophone regions bordering Nigeria.
A Nigeria Police Force spokesman did not respond to calls and text message requests for a comment.
Amnesty International says the women & girls were turned into cooks, sex slaves & fighters.
Amnesty International says there are ancient cave paintings depicting male-to-male sex.
The British Foreign Office Minister is "deeply concerned" by reports that Gambia executed prisoners.
