Jagath Jayasuriya left Brazil on Sunday to return to Sri Lanka after completing his two-year tour of service, acting head of mission Premaphilake Jayakody told The Associated Press.
"He is no longer ambassador," Jayakody said.
He declined to comment on allegations in criminal suits that rights groups began filing the previous day in the six countries where Jayasuriya represented Sri Lanka.
The suits are based on Jayasuriya's role as a commander in the final phase of Sri Lanka's civil war in 2009. They allege he oversaw military units that attacked hospitals and killed, disappeared and tortured thousands of people.
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On Monday, Carlos Castresana Fernandez, the lawyer coordinating the effort, said suits had been filed in Brazil and Colombia and more were coming soon for Argentina, Chile and Peru. He said Suriname had refused to accept the petition.
"This is one genocide that has been forgotten, but this will force democratic countries to do something," Fernandez said. "This is just the beginning of the fight."
With Jayasuriya out of the country, the petitions can be amended to ask for arrest warrants in the case he returns, Fernandez said.
Speaking to reporters in London, Yasmin Sooka, executive director of the International Truth and Justice Project, said they believed that Jayasuriya had been tipped off about plans for the suits and fled.
The nations where Jayasuriya was ambassador have their own dark histories of violence, including military dictatorships, torture and the killing or disappearance of thousands.
Fernandez, the coordinating lawyer, was one of the attorneys who worked on international cases against former dictators Gen Jorge Rafael Videla of Argentina and Gen Augusto Pinochet of Chile. He has also helped win indictments in war crimes and organized crime cases in Guatemala, including one against ex-President Alfonso Portillo.
Fueled in part by ethnic tensions between Sinhalese and Tamil citizens, an insurgency against the government was led by a group called the Liberation Tigers of Tamil Eelam. They fought to establish a separate Tamil state in the northeastern part of the island.
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