Kenya's electoral commission has said it is auditing election results so far tallied to iron out discrepancies that have been detected. With 87% of constituencies declared from Monday's vote, Uhuru Kenyatta retains a significant lead over his rival Prime Minister Raila Odinga. He has 50% of the vote, against 43.3% for Mr Odinga. A candidate needs more than 50% to avoid a run-off. Officials had said the results would be finalised on Friday. "There may have been errors and discrepancies here and there. Some we have already detected and we are working on them," Kenya's Daily Nation newspaper quotes James Oswago, chief executive of the Independent Electoral and Boundaries Commission (IEBC), as saying. It is not clear how long the audit will take and if the results of the largely peaceful poll will still be declared on Friday evening. Mr Kenyatta faces trial in The Hague in July for crimes against humanity. He is accused of fuelling communal violence after the 2007 election that saw more than 1,000 people killed and 600,000 forced from their homes. He denies the accusations. Trials at the International Criminal Court (ICC) typically last for years, but Mr Kenyatta says it would not prevent him from doing his job, if elected. Countries including the US and UK have hinted that his election as president would have consequences for their relations with the Nairobi government - comments which have been dismissed in Nairobi as unwanted foreign interference in domestic matters. On Friday, the ICC agreed to postpone the trial on similar charges of Mr Kenyatta's running mate, William Ruto, by a month till May after his lawyers complained of not having enough time to prepare his defence.