The Eurovision Song Contest appears to have been targeted by hackers who want to influence the voting for the final song selection in the qualifier.
Votes began flooding the Melodifestivalen app yesterday after Jon Henrik Fjällgren's performance, forcing the contest organizers to reset the votes.
Chief Mananger Christel Tholse Willers called the wave of votes “extreme overload”.
"We are investigating the attack. Our servers are configured for a very heavy load, but what hit us was abnormal and extreme," Willers said.
Of the 3.7 million viewers who watched the Eurovision, around half a million of them used the app, increasing votes compared to last year by around 400%. Telephone (voice) voting as well as SMS voting remain the preferred methods for 1.5 million viewers.
Security tests by researchers claimed that the Melodifestivalen app was vulnerable to attacks.
The £100,000 app requires users to log in via Facebook or Google Plus, or register using their mobile numbers.
