US envoy Stephen J Rapp concluded his week-long visit during which tweets from the US mission here carried photos of alleged sites in the north where people were killed allegedly due to Lankan military shelling in 2009 war against the LTTE.
Rapp had listened to eyewitness accounts of rights abuses "including those that occurred at the end of the war", the statement said.
The US encourages Sri Lanka to seek the truth through independent and credible investigations and to carry out prosecutions, the statement said.
The Lankan military has denied US accusations levelled through photographs during Rapp's visit which came ahead of the March sessions of the UN Human Rights Council.
The US has told Lanka that it could introduce a third successive resolution over rights accountability and reconciliation with the Tamil minority at the Council. Two previous resolutions both US moved were supported by India.
A protest was sparked when Rapp told the main Tamil party TNA that the March resolution would push for a international war crimes investigation.
