Four radical person been charged successful an probe into suspected bribery astatine the European Parliament by a Gulf authorities - reportedly Qatar.
Greek MEP and European Parliament Vice President Eva Kaili was among those antecedently arrested successful the case.
Prosecutors fishy the Gulf authorities tried to power parliament decisions with donations of wealth oregon gifts.
Local media person reported that the accused state is Qatar, which the Qatari authorities has denied.
Watchdogs and absorption MEPs person said it could beryllium 1 of the biggest corruption scandals the European Parliament has ever seen.
Ms Kaili, 1 of 14 elected vice presidents, has been suspended from the parliament's Socialists and Democrats Group and expelled from the Greek centre-left Pasok party.
Cash worthy astir €600,000 ($632,000; £515,000) was seized by Belgian constabulary successful 16 searches successful Brussels connected Friday. Computers and mobile phones were besides taken successful bid to analyse their contents.
A full of six radical were detained for questioning, 2 of whom person been released.
"Four individuals person been arrested by the Brussels investigating justice who is starring the investigation," the Belgian national prosecutor's bureau said successful a statement.
"They are charged with information successful a transgression organisation, wealth laundering and corruption. Two persons person been released by the investigating judge."
The authoritative said investigators had suspected that a Gulf authorities had been influencing economical and governmental decisions of the parliament for respective months, particularly by targeting aides.
Local media has named the Gulf authorities nether suspicion arsenic Qatar.
A Qatari authorities spokesperson told AFP: "We are not alert of immoderate details of an investigation. Any claims of misconduct by the State of Qatar are gravely misinformed."
The state "operates successful afloat compliance with planetary laws and regulations", helium added.
A spokesperson for the European Parliament told Reuters that it would not remark connected an ongoing investigation, but would enactment unneurotic with the section authorities if needed.
Ms Kaili's responsibilities arsenic a vice president see the Middle East.
She has been a defender of Qatar successful the past.
In a speech past period astir quality rights during the Fifa World Cup successful Qatar, she called the state a "frontrunner successful labour rights", for abolishing kafala, a ineligible model utilized successful respective Gulf states which quality rights organisations comparison to modern slavery.
"The World Cup successful Qatar is proof, actually, of however sports diplomacy tin execute a humanities translation of a state with reforms that inspired the Arab world," she said.
She accused immoderate MEPs of bullying and discriminating against Qatar, adding: "They impeach everyone that talks to them oregon engages of corruption."
Qatar has antecedently been accused of corruption, including successful its bid to big the 2022 shot World Cup. The state denied the allegations and was cleared of corruption by Fifa.