A senior United States diplomat says Sri Lanka's government has made little progress on justice, reconciliation and accountability five years since the end of the civil war.

Assistant Secretary of State Nisha Biswa says lack of progress in Sri Lanka has frustrated her government and the international community.

Biswa told reporters at the end of her visit Saturday that the international community's patience is wearing thin. She says the U.S. will sponsor a resolution asking Sri Lanka to do more on reconciliation and accountability at the U.N. Human Rights Council in March.

She also expressed concern about the worsening human rights situation.

International pressure is growing on Sri Lanka to probe allegations of war crimes during the conflict that ended in 2009 with the defeat of Tamil Tigers.