Senior UN officials on Thursday called for a prompt and rigorous investigation into the killing of a renowned Congolese human rights defender whose body has been found on the outskirts of the capital, Kinshasa, one day after he was reportedly summoned to a police station. UN Secretary-General Ban Ki-moon, UN High Commissioner for Human Rights Navi Pillay, the UN Special rapporteur on extrajudicial, summary or arbitrary executions, Philip Alston, and Alan Doss, the head of the UN peacekeeping force in the Democratic Republic of the Congo (known as MONUC), have all issued statements condemning the murder of Floribert Chebeya Bahizire. Chebeya's body was found on Wednesday, a day after human rights organizations in Kinshasa reported that he had disappeared after being summoned to police headquarters. His driver, Fidele Bazana, is still missing since Tuesday evening. In his role as president of the non-governmental organization ( NGO), known as Voix des Sans Voix (Voice of the Voiceless), Chebeya focused on human rights abuses in the DRC, including corruption in the military and the links between militias and foreign political forces. He was also the executive secretary of the Reseau National des ONG des Droits de l'homme de la Republique democratique du Congo ( Democratic Republic of Congo National Network of Human Rights NGOs RENADHOC). In a statement issued by his spokesperson, Ban paid tribute to Chebeya, saying 'his reputation as a champion of human rights earned him the respect and admiration of his compatriots and of the international community. His work will be remembered as a tribute to Congolese perseverance.' Ban noted that the Congolese Interior Ministry has ordered the State security service to investigate the death of Chebeya and the disappearance of Bazana and stressed that the probe must be ' thorough, transparent and independent, with full respect for due process and rule of law.' In her statement, Pillay observed that Chebeya 'had survived many death threats, arrests, and ill treatment due to his work as a human rights defender. He believed in the cause of human rights and was not afraid to pursue it against all odds.' She said that Chebeya was considered to be a human rights pioneer in the DRC, speaking out under the repressive rule of the former dictator Mobutu Sese Seko and then again during the rule of the former president Laurent-Desire Kabila and the current national government. The UN high commissioner added that the killing is part of a growing trend of intimidation and harassment of human rights defenders, journalists, political opponents, victims and witnesses in the DRC. Earlier on Thursday, Doss, who is also the UN secretary-general 's special representative in the DRC, said Congolese authorities must swiftly begin an inquiry into the circumstances surrounding the killing. Alston said the circumstances 'strongly suggest official responsibility' and he echoed the calls for an independent investigation. He also paid tribute to Chebeya, describing him as a 'hugely respected human rights leader.' 