It is feared that the young men, who disappeared from Swift Operation Squad detention in Port Harcourt a year ago, were extrajudicially executed.

Members of human rights organization Social Action were stopped and detained earlier this month after leaving their office.

Clear patterns of abuse have emerged during the latest cycle of violence, which began when armed opposition groups launched a major offensive against the government last May.

An increase in harassment, arbitrary arrests, detentions, torture and other ill-treatment by security forces is anticipated ahead of April's elections.

Amnesty International has called for the promised investigation into the alleged killing by Kenyan police of seven men to be impartial, independent and for the results to be made public.

Speaking at an anti-death penalty summit in Geneva, Amnesty International's interim Secretary General Claudio Cordone hailed global efforts but said more needs to be done.

Gertrude Hambira fled after five men and one women who identified themselves as officers from the Criminal Investigation Department raided her office.

Blaise Compaoré expressed his commitment to emergency obstetric care and access to family planning to delegation led by interim Secretary General Claudio Cordone.