BERN --
A whistleblower has given potentially key evidence to Swiss prosecutors in their investigation of FIFA and suspended president Sepp Blatter.
The spokesman for Switzerland's attorney general's office, Andre Marty, revealed progress in the case in an interview with German broadcaster ARD.
Marty says ''a witness, a so-called whistleblower, gave us interesting information relevant to the case, which brought us markedly forward in the criminal investigation.''
Swiss attorney general Michael Lauber opened criminal proceedings against Blatter four months ago and raided his office at FIFA.
Blatter was quizzed about suspected criminal mismanagement and misappropriation of FIFA money linked to a $2 million payment to Michel Platini and selling undervalued World Cup TV rights for the Caribbean.
Marty says formal charges could be brought by the end of the year.
