FIFA President Sepp Blatter pauses during a news conference at the FIFA headquarters in Zurich, Switzerland, June 2, 2015.

Swiss prosecutors have opened a criminal investigation into Sepp Blatter, the head of world soccer body FIFA, on suspicion of criminal mismanagement and misappropriation, the Swiss attorney general's office said on Friday.

Blatter was interrogated after a meeting of FIFA's executive committee in Zurich, and authorities carried out a search at FIFA headquarters on Friday.