The Colombo government held "very high-level" talks to prevent General Sarath Fonseka, currently visiting Oklahoma, from being quizzed over his conduct during the conflict against the Tamil Tigers, the official said.
The privately-run Sunday Times newspaper here said Fonseka had been asked to present himself for an interview with the Department of Homeland Security on Wednesday.
The move "prompted fears in Colombo that Washington is asserting its legal authority over the 'war crimes' report" released last month, the paper said referring to a State Department dossier on alleged war crimes.
The report outlined excesses by security forces and Tiger rebels during the final stages of fighting earlier this year. The report, submitted to the US Congress, refers to Fonseka's having overstepped his brief.
The Sunday Times said the Sri Lankan diplomatic mission there was already providing legal assistance to Fonseka.
Fonseka is a US Green Card holder and travelled to the US last week to visit his two daughters. He also addressed a group of Sri Lankans in Washington last week and took credit for leading the battle to crush the Tigers.
The US embassy in Colombo declined comment.
The State Department report cited allegations that Tamil rebels recruited children and that government forces broke a ceasefire as well as killed rebels who surrendered.
It also cited reports in which it was claimed government troops or government-backed paramilitaries "abducted and in some instances then killed Tamil civilians, particularly children and young men."
The report covered the period from January -- when fighting intensified -- until the end of May, when Sri Lankan troops defeated the Liberation Tigers of Tamil Eelam (LTTE) at the end of a decades-old separatist conflict.
Sri Lanka last week announced it was appointing a panel to investigate the allegations after initially dismissing the report as "unsubstantiated."
The island's government managed to stave off a UN human rights council debate on alleged war crimes and crimes against humanity thanks to the backing of veto-holders China and Russia.
The UN has said that up to 7,000 civilians perished during the last four months of fighting and accused both the military and the Tigers of not doing enough to protect civilians.
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