This was conveyed to European Parliament by Sri Lankan Ambassador to European Union PM Amza yesterday, a government statement said.
The investigation is to happen irrespective of Sri Lanka's categorical rejection of the Channel-4 footage in the "Killing Fields" series where three different segments were aired.
Amza, a native Tamil speaker, has said that he could provide ample evidence to prove that Channel-4 had a sinister motive to discredit Sri Lanka in connivance with the pro-LTTE diaspora organisations.
The Ambassador pointed that in the "Killing Fields" documentary, the civilians who spoke in Tamil at no stage stated that the attacks were carried out specifically by the Sri Lankan Army, rather they always mentioned that "they attacked", leaving it ambiguous.
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The Ambassador also refuted allegations on the killing of a 12-year-old boy identified as the son of the slained LTTE leader Thiruvenkadam Velupillai Prabhakaran.
Amza, however, has reiterated Sri Lanka's request to Channel-4 to provide original materials available with them to help the investigation process.
Sri Lanka's Lessons Learnt and Reconciliation Commission had recommended an independent investigation to verify the authenticity of the Channel-4 footage.