A government source in Colombo, who declined to be named, said US Assistant Secretary of State for Central and South Asian Affairs, Robert Blake, was expected next week.
“The US is mounting pressure on us this time, but we should be able to get over the difficulties because we have strong support from India,” the government source said.
A diplomatic source confirmed that Washington was engaging with Colombo ahead of the Geneva rights council session, which runs from February 27 to March 23.
The privately-run Sunday Times newspaper said Blake will be accompanied by Marie Otero, the under secretary for civilian security, democracy and human rights.
Ambassador at large for global criminal justice, Steven Rapp, is due Monday, reported the paper.
There was no immediate comment from the US embassy or Sri Lanka’s external affairs ministry about the latest US initiative to ramp up pressure on Colombo.
Sri Lanka has managed to avoid censure at previous human rights council meetings thanks to the backing of Russia and China. India, the island’s closest neighbour, has also backed Colombo.
Rights groups have said up to 40,000 civilians were killed in the government’s military campaign to defeat Tamil Tiger rebels, which they completed in May, 2009.
Sri Lanka denies that a single civilian was killed by its troops.
However, a government-appointed panel, which probed the reasons behind the failure of a 2002 truce, reported in December that civilians may have died as a result of military action and called for an independent investigation.
The UN has estimated that up to 100,000 people were killed in Sri Lanka’s bloody ethnic war between 1972 and 2009.