"We see this as an act of cyber terrorism," Secretary to the Ministry of Media Charitha Herath said while describing it as the work of the LTTE rump living overseas.
The unidentified hackers yesterday on the ministry's website uploaded a link to an Australian Broadcasting Corp report on atrocities during the final stages of Sri Lanka's conflict against Tamil Tigers in 2009.
"Stop Killing Innocent Tamil Ppl! Or Get prepared 4 Attacks From Us!" read a message left on the website, media.Gov.Lk.
"They operate on various fronts, this is (cyber) just one of them," he said, adding that the timing was significant as Lanka's alleged rights atrocities was coming under the focus of the UN Human Rights Council's ongoing sessions which kicked off in Geneva yesterday.
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Rights groups accuse the media ministry of scuttling the freedom of web based media.
Websites carrying anti-government content are being locally blocked by the internet service providers on ministry's orders, they claim.
Meanwhile, the government officials said that they had protested at the UNHRC sessions yesterday against the move to screen the British Channel 4 television's 'No Fire Zone' documentary which gave pictures of alleged summary executions.