SAO PAULO (AP) — Lawyers for former President Luiz Inacio Lula da Silva said Thursday that they have filed a petition at the U.N. Human Rights Committee alleging a lack of impartiality and abuse of power by the judge investigating the mammoth corruption-kickback scandal at Brazil's state-owned oil company Petrobras. Besides Silva's attorneys, the petition filed in Geneva was also signed by British lawyer Geoffrey Robertson, a human rights specialist. From his office in London, Robertson told reporters in Sao Paulo during a conference call that the petition details alleged violations of the International Covenant on Civil and Political Rights by Judge Sergio Moro, who is leading the Petrobras investigation.Read more on NewsOK.com