Video game developer Rovio has confirmed that hackers defaced its Angry Birds site with an image entitled Spying Birds, featuring an NSA logo.

The attack followed the publication of leaks that indicated the US spy agency and its British counterpart GCHQ had obtained data released by at least one of the Finnish firm's games.

The company said it did not "collaborate or collude" with any government spy agency.

It added it had quickly fixed its site.

"The defacement was caught in minutes and corrected immediately," said marketing manager Saara Bergstrom.

"The end user data was in no risk at any point. Due to how the internet name resolution works, for most areas it was not visible at all, but some areas take time for the correct information to be updated.

"This attack looks to be similar to the New York Times attacks from last year."

The Syrian Electronic Army (SEA) - a group supporting Syrian president Bashar al-Assad - said it carried out an attack on the New York Times last August.

After Tuesday's attack, a Twitter account associated with the group posted a link to a saved copy of the spoof Angry Birds image and the message: "A friend hacked and defaced @Angrybirds website after reports confirms its spying on people. The attack was by 'Anti-NSA' Hacker, He sent an email to our official email with the link of the hacked website."

BBC News