Qatar, the Gulf state accused of being behind the scandal, has denied any involvement in the scandal.
A Belgian judge has charged four people with receiving money and gifts from a Gulf state in order to influence decisions in the European Parliament, putting the European Union’s credibility at risk.
Prosecutors searched 16 homes in Brussels on Friday and seized 600,000 euros ($631,800) as part of an investigation into money laundering and corruption.
Initially, six people were detained. Prosecutors said in a statement on Sunday that four people had been charged and two had been released. They did not name any of the individuals involved.
Prosecutors said they had suspected for months that a Gulf state was trying to influence decisions in Brussels.
As various media outlets reported that Qatar was the Gulf state at the centre of the allegations, a Qatari official said the country “categorically rejects any attempts to associate it with accusations of misconduct”.
“Any association of the Qatari government with the reported claims is baseless and gravely misinformed,” the official said in a statement sent to Al Jazeera on Sunday.
“The State of Qatar works through institution-to-institution engagement and operates in full compliance with international laws and regulations,” the official added.
‘Very worrisome’
European Union Foreign Affairs chief Josep Borrell said on Monday that the news is “very worrisome”.
Borrell said the investigation did not involve anyone from the EU’s diplomatic service.
“There is nothing and no one being referred to neither from the External Action Service nor from the delegations,” he said.
The European Parliament said on the weekend it had suspended the powers and duties of one of its vice presidents, Greek socialist Eva Kaili, in light of the Belgian investigation.
The Greek socialist PASOK party said in a statement that it was expelling Kaili from its ranks.
It was not immediately clear if she had been charged in the case. Her office did not answer telephone calls or respond to an email requesting comment.
Prosecutors said they had also searched the home of a second EU politician on Saturday, without detaining anyone.
Belgian Socialist party member Marc Tarabella confirmed it was his home and that a computer and mobile phone had been taken.
“The justice system is doing its work of gathering information and investigating, which I find totally normal. I have absolutely nothing to hide and I will respond to all questions of the investigators,” he said in a statement.
Credibility at stake
European Economics Commissioner Paolo Gentiloni told Italy’s Rai 3 television that the case appeared to be “very serious”.
“If it were confirmed that someone took money to try to influence the opinion of the European Parliament, it will really be one of the most dramatic stories of corruption in recent years,” he added.
Irish Foreign Minister Simon Coveney said on Monday that the news is “damaging”.
“This is a scandal that we need to expose the truth around so we can ensure it doesn’t happen again,” Coveney told reporters in Brussels.
The credibility of the European Union is at stake, German Foreign Minister Annalena Baerbock warned on Monday.
“This is an unbelievable incident which has to be cleared up completely with the full force of law,” she told reporters as she arrived for a meeting with her EU counterparts in Brussels.
“This is about the credibility of Europe, so this has to trigger consequences in various areas.”
The European Parliament is due to vote this week on a proposal to extend visa-free travel to the EU for Kuwait, Qatar, Oman and Ecuador.
Some legislator have suggested the debate and vote should be postponed.