New Delhi: In a letter to DMK chief M Karunanidhi, Prime Minister Manmohan Singh has said that he has emphasised the need for probe into the rights violation charges by Sri Lanka over 'war crimes'.PromotedListen to the latest songs, only on JioSaavn.comHere's the full text of the letter:Also ReadSri Lanka Rejects UN Move To Protect War Crimes EvidenceSri Lanka Divided As Panel Backs Foreign Judges To Probe War CrimesSri Lanka Seeks Donald Trump's Help To Drop War Crimes Charges