The group wanted the European Commission to act quickly to prevent Google from repeating “its desktop abuses” in mobile, lawyer Thomas Vinje said in a statement.
The U.S. government concluded a two-year investigation into Google earlier this year with a ruling that the search engine company did not breach U.S. antitrust laws.
But a similar investigation by EU regulators, launched in November 2010, remains open, and preliminary findings released last year found the company was violating European law in four ways.