Google continues to be in hot water with the European Union.
The EU is preparing a third antitrust complaint against the online search giant, targeting its core advertising services business, according to Bloomberg. Adwords, which places ads next to search results, is the company's most lucrative business.
Previously, the EU complained that Google unfairly promotes its own shopping services over rivals and accused the company of prioritizing its mobile services in its Android software.
Spokesmen from Google and the European Commission declined to comment.