A group of hackers, who have been identified as H4x0r HuSsY, hacked Sri Lanka's media ministry website where they placed a documentary with the video.
A message, which was emerging at the left on the site, media.gov.lk, reads, "Stop Killing Innocent Tamil Ppl! Or Get prepared 4 Attacks From Us!"
The officials of the government site were quoted as saying, "The hackers exploited a loophole over the weekend, but we have plugged it now." According to the sources, the documentary along with the video has been removed now.
Sri Lanka allegedly had killed over 40,000 civilians during the last stage of its battle against Liberation Tigers of Tamil Eelam (LTTE) in 2009. However, the country overruled all allegations and rejected demands of independent internal investigation.
Controversy over Sri Lanka and war crimes against Tamils was ignited by the release of some pictures of Prabhakaran's 12-year-old son Balachandran.
The photographs were parts of a documentary - No War Zone: The Killing Fields of Sri Lanka. The documentary will be screened at the meeting in Geneva.
Contradicting to Sri Lankan officials' statements, the photos show how Balachandran was given snacks before his execution at a camp operated by Sri Lankan security forces.
Meanwhile, another report claimed that Lankan security forces had raped and sexually assaulted Tamil women to teach lessons.
The Human Rights Watch (HRW) 140-page report, "We Will Teach You a Lesson: Sexual Violence against Tamils by Sri Lankan Security Forces," states horrific incidents of sexual violence, rape, and third degree torture unleased on Tamil women and men by Sri Lankan forces.