Google is facing a €4.3 billion fine from the European Commission on Wednesday over its Android mobile operating system.

The EU’s trio of investigations
According to Reuters, a source close to the matter said Competition Commissioner Margrethe Vestager, would confirm the antitrust fine which is nearly double the previous record fine the U.S. tech company received last year.

A €2.4 billion ($2.8bn; £2.1bn) fine which Google received over its online shopping search service; a ruling it is in the process of appealing against.

The penalty is scheduled to be confirmed at a news conference in Brussels at 1100 GMT.

A third investigation is underway into the firm’s advert-placing business AdSense.

The European regulators have said the company prevented third parties using its product, from displaying search advertisements from Google’s competitors.

The EU has been investigating Android since April 2015, following complaints by FairSearch; a trade group that included competitors Microsoft, Nokia and Oracle as some of its members, that Google has been abusing its market dominance in software that runs on smartphones.

The Commission eventually accused Google of anti-competitive behaviours which Google denied.

Accordig to Reuters, some U.S. officials have complained that the Commission is following a protectionist course, while Vestager, a former Danish minister who is seen as a rising star in EU politics, insists she is merely enforcing laws to protect consumers.