Swiss authorities have seized computer equipment from FIFA offices as part of an investigation into corruption in football's governing body.
Prosecutors reportedly took IT data from the offices of both FIFA outgoing President Sepp Blatter and FIFA Secretary General Jerome Valcke at the headquarters in the Swiss city of Zurich.
"I can confirm that FIFA handed over today seized IT data to the OAG," said a spokesman for Switzerland's Office of the Attorney General (OAG).
"As already communicated, the OAG has opened criminal proceedings against persons unknown."
FIFA were not immediately available for comment.
Last month, the OAG opened criminal proceedings against individuals suspected of corruption over the awarding of the 2018 and 2022 World Cups in Russia and Qatar.
Earlier, FIFA said it had postponed the bidding process for the 2026 World Cup.
Bidding had been due to begin shortly, with a vote to choose the host scheduled to be held at the FIFA Congress in May 2017 in Kuala Lumpur.
FIFA Secretary General Jerome Valcke said: "Due to the situation, I think it's nonsense to start any bidding process for the time being. It will be postponed."
Mr Valcke also responded to claims that he was involved in a US$10m (€8.84m) payment to a disgraced football official, relating to the 2010 World Cup in South Africa - which is now being investigated by US authorities.
He denied any wrongdoing.
"It was not FIFA's money...it was request from the official South African authorities and South African FA, and as long as it was in line with rules, we do it," he said, in his first public comments since the scandal broke out.
"You've decided that after Blatter I'm the head to be cut? Fine...But I'm not responsible".
Last week, Mr Blatter announced he would resign as FIFA President. It came days after he was elected for a fifth term.
Russia and Qatar could lose the right to host the 2018 and 2022 World Cups if any evidence of corruption is found.
Domenico Scala, the head of FIFA's auditing and compliance committee, said the tournaments may be taken away if either country's selection was "thanks to bribes".
However, he stressed "this evidence has not been provided" so far.
The FBI has launched a separate investigation into the FIFA scandal.
Seven serving FIFA officials have been arrested in Switzerland on corruption charges, including vice-presidents Jeffrey Webb - the current CONCACAF president - and Eugenio Figueredo from Uruguay.
The others are Eduardo Li, Julio Rocha, Costas Takkas, Rafael Esquivel and Jose Maria Marin.
In addition, two former FIFA officials, Jack Warner - the former president of CONCACAF- and Nicolas Leoz, have been indicted.
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