Swiss prosecutors say they are investigating five clubs in Switzerland as part of European football's biggest corruption scandal.
Jeannette Balmer, a spokeswoman for the federal prosecutors' office, says Swiss second-tier clubs FC Thun, Gossau, Wil 1900 and Schaffhausen, along with third-tier Fribourg, are under investigation.
She said on Wednesday that authorities were examining the second leg of the 2008/09 season and the first leg of the 2009/2010 season.
The Swiss football federation says a total of 17 league games and two test games were affected.
Switzerland is one of nine countries named in European football's biggest corruption scandal uncovered in a German-led betting scam probe.
swissinfo.ch and agencies