Brazil's state oil giant Petrobras on Friday again postponed, this time until Monday, the much-expected release of details on the causes of last month's sinking of its biggest offshore oil rig. The company said members of its investigation team would now only speak of their probe to the media and reveal some preliminary findings on Monday. Officials said the team of investigators needed more time to consolidate their report. The latest postponement delays the preliminary report on the debacle by three days. The company should on Monday give a new time table for the investigation in addition to presenting a preliminary analysis tragedy. The investigation is making use of Norway's shipping classification agency Der Norske Veritas as independent consultants.