Angry Birds creator Rovio says the game's website has been defaced by hackers, two days after reports the personal data of its customers might have been accessed by US and British spy agencies.

"The defacement was caught in minutes and corrected immediately," said Saara Bergstrom, a spokeswoman for the Finnish company. "The end-user data was in no risk at any point."

Hacked: The Angry Birds website was defaced following spying claims. Credit:AP

Reports earlier this week said documents leaked by former National Security Agency (NSA) contractor Edward Snowden suggested the NSA and Britain's Government Communications Headquarters, or GCHQ, had been able to extract information through numerous smartphone apps, including Google Maps and the Angry Birds game franchise.