Google’s Paris offices were raided by French prosecutors and police amid a probe into alleged tax fraud. The raids are part of probe opened in June 2015 to investigate suspected “"ggravated fiscal fraud" after French tax authorities lodged a complaint, according to a statement from France’s financial prosecutor on Tuesday.

Google faces outrage in Europe over the small amount of tax it pays in the region. France has called on the company to pay back taxes of about 1.6 billion euros ($1.8 billion)

Earlier this year Google reached a 130 million pound ($190 million) settlement with the U.K. government over an audit covering 10 years of accounts. Critics called the amount "derisory."

The investigation will aim to verify whether Google’s Irish unit has permanent establishment in France and whether the firm failed to declare part of its revenues in France, according to the statement from the office of the financial prosecutor.