Criminal proceedings have been opened against FIFA president Sepp Blatter by Swiss authorities.
He was interviewed today by Swiss police. Mr Blatter's office was also searched and data was seized.
He is suspected of making a "disloyal payment" of two million Swiss francs to UEFA president Michel Platini.
Under Swiss law, a payment is classified disloyal if it is against the best interest of the employer - in this case FIFA.
Mr Platini, who is the favourite to succeed the outgoing Mr Blatter as FIFA president next February, was a personal adviser to his former mentor when he started out in football politics.
The payment by Mr Blatter from FIFA funds was "allegedly made for work performed between January 1999 and June 2002," the attorney general's office said.
The Swiss federal office says Mr Blatter was interrogated after chairing a meeting of FIFA's executive committee on Friday.
Mr Platini has given evidence as a witness.
FIFA said: "Since 27 May 2015, FIFA has been cooperating with the Office of the Swiss Attorney General (OAG) and has complied with all requests for documents, data and other information.
"We will continue this level of cooperation throughout the investigation.
"Today, at the home of FIFA, representatives from the Office of the Swiss Attorney General conducted interviews and gathered documents pursuant to its investigation.
"FIFA facilitated these interviews as part of our ongoing cooperation. We will have no further comment on the matter as it is an active investigation."
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