It is feared that the young men, who disappeared from Swift Operation Squad detention in Port Harcourt a year ago, were extrajudicially executed.
Activists from 18 countries call on Sudanese parties to ensure that the elections do not become a flashpoint for increased violence and human rights abuses.
Members of human rights organization Social Action were stopped and detained earlier this month after leaving their office.
Artist Owen Maseko was arrested after participating in a show depicting atrocities that took place in the Matabeleland region in the 1980s.
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.
Amnesty International calls on the Malawian authorities to immediately and unconditionally release two men, after a judge ruled that they will face trial in April on charges of “gross indecency”.
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 on the Gambian government to immediately charge or release all former government officials detained during a wave of arrests over the past week.
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.
As attacks on the civilian population and humanitarian agencies continue, the government has requested that MONUC, the UN peacekeeping mission, withdraws from the country by June 2011.
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.
Unrest across the country is linked to calls from supporters of President Gbagbo, for tens of thousands of "foreigners" to be excluded from the electoral roll.
Gertrude Hambira fled after five men and one women who identified themselves as officers from the Criminal Investigation Department raided her office.
Radio correspondent Ali Yusuf Adan was taken after the broadcast of a report alleging that the armed group had killed a man in the Wanleweyn district.
Blaise Compaoré expressed his commitment to emergency obstetric care and access to family planning to delegation led by interim Secretary General Claudio Cordone.