More info here:
https://www.admin.ch/gov/en/start/documentation/media-releases.msg-id-57391.html
http://www.fifa.com/about-fifa/news/y=2015/m=5/news=press-conference-live-at-11-00-cet-2609064.html
In addition to arrests and seizure of documents in Switzerland, FBI raided the Miami offices of CONCACAF:
http://www.miamiherald.com/news/local/community/miami-dade/article22409883.html