Protesters furious at the imprisonment of punk band Pussy Riot have hacked into the website of the court that sentenced them.
The site's homepage has been defaced with obscenities and an anti-Putin slogan, a court spokeswoman has said.
And a new song from the band, entitled Putin Is Lighting The Fires Of The Revolution, has been uploaded on to the page.
The website was swiftly taken down so anyone trying to access it only saw a message saying that "this webpage cannot be found".
It has been rumoured that notorious internet hacking group Anonymous are behind the cyber attack.
Meanwhile, the three members of Pussy Riot who have been given two years in jail for "hooliganism motivated by religious hatred", have scotched talk of any appeal against their sentences.
A representative for Nadezhda Tolokonnikova, 22, Maria Alyokhina, 24, and Yekaterina Samutsevich, 30, told how they said: "Go to hell with your pardon."
Police officers are now hunting the remaining two band members. Their identities are not publicly known.
The furore began in February when five members of the feminist punk band broke into a Moscow cathedral, wearing head gear to protect their identities, and performed a protest song against President Vladimir Putin.
