The US Ambassador-at-Large at the Office of Global Criminal Justice, Stephen J Rapp, concluded his week-long visit to Sri Lanka during which tweets from the US mission here carried photos of alleged sites in the north where people were killed due to Lankan military shelling in the 2009 war.
Rapp had listened to eyewitness accounts of rights abuses "including those that occurred at the end of the war", a statement from the US embassy said here.
"...The government of the US encourages the government of Sri Lanka to seek the truth through independent and credible investigations, and where relevant, have prosecutions," it said.
Rapp called on Foreign Minister G L Peiris on Friday.
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Sri Lanka has denied charges that around 40,000 ethnic Tamil civilians were killed by the army during the final push that crushed the LTTE.
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 in Geneva.
Rapp's visit met with a protest opposite the US embassy. A nationalist group slammed the US for interfering in the country's internal affairs.
A protest was sparked when Rapp told the main Tamil party TNA that the March resolution would push for an international war crimes investigation.