Belgian investigators searched offices at the European Parliament in Brussels on Monday, in a probe into alleged bribes from World Cup host Qatar.
It was the 20th search carried out since Friday and the parliament president, Roberta Metsola, warned MEPs that “democracy is under attack”.
Belgian police have charged four people, among them European Parliament Vice-President Eva Kaili, a Greek MEP.
Qatar has denied any wrongdoing and Ms Kaili’s lawyer says she is innocent.
