The Syrian Electronic Army claimed responsibility for hacking some of US broadcaster CNN's social media accounts.
The network said the compromised accounts included its main Facebook page, its Twitter page and blogs for "The Situation Room" and "Crossfire."
"The posts were deleted within minutes and the accounts have since been secured," it said in a story on its website.
It added yesterday that one of the posts on its Twitter account said: "Syrian Electronic Army Was Here...Stop lying... All your reports are fake!"
On its Twitter feed, the SEA said it was behind the hack.
"Tonight, the #SEA decided to retaliate against #CNN's viciously lying reporting aimed at prolonging the suffering in #Syria," it said.
The group, which backs Syria's government, has previously hacked accounts of Skype, as well as The New York Times, Agence France-Presse and other media organisations.