Zurich police confirmed Friday they were responding to a bomb alert at the venue where FIFA is hosting its widely-watched annual congress, amid a massive corruption scandal rocking world football's governing body.

Zurich police spokeswoman Brigitte Vogt confirmed to AFP that a bomb alert had been received at the venue.

"The police are there," she said, refusing to provide further details.

Those arrested officials now face extradition to the United States where they are accused of allegedly accepting bribes worth tens of millions of dollars.

Following the arrests, Swiss investigators separately announced they are looking into the awarding of the 2018 and 2022 World Cups to Russia and Qatar.