Amnesty International has urged the United Nations to establish a credible investigation into war crimes allegedly committed in Sri Lanka during the final phases of the country's civil war in 2009. Amnesty said most civilian casualties in the final phases of the war were caused by government shelling. The London-based watchdog today said that Sri Lanka's official inquiry into the matter is seriously flawed and falls short of international standards. The Amnesty said the national commission announced by Sri Lankan President Mahindra Rajapaksa in 2010 to investigate into the allegations, is unlikely to deliver justice for the tens of thousands of victims of war crimes. It said the investigation has so far made no recommendation for bringing individuals to justice, and has failed to protect Sri Lankans who offer testimony. The U.N. Human Rights Council is expected to discuss Sri Lanka at a three-week session starting on Monday.