COLOMBO, Sri Lanka  To many Americans, Maya Arulpragasam, known as M.I.A., is the very pregnant rapper who gyrated across the stage at Sunday’s Grammy Awards.

Yet in Sri Lanka, where she spent her childhood years, M.I.A. remains virtually unknown. And some who do know her work say she is an apologist for the separatist Tamil Tiger rebels fighting in the country’s long-running civil war.

M.I.A.  who has been nominated for an Oscar for the song she co-wrote for the hit film “Slumdog Millionaire”  has branded herself through music videos and interviews as the voice of the country’s Tamil minority. In the video for her song “Bird Flu,” for instance, children dance in front of what looks like the rebels’ logo: a roaring tiger.

“Being the only Tamil in the Western media, I have a really great opportunity to sort of bring forward what’s going on in Sri Lanka,” she said in an interview on the PBS program “Tavis Smiley” last month. “There’s a genocide going on.”