By Rolfe Winkler 

Google Inc. escaped a U.S. antitrust investigation nearly unscathed in 2013, but the company isn't out of the regulatory woods.

Disclosures that some staffers at the U.S. Federal Trade Commission had recommended charging Google with violating antitrust laws are adding fuel to a long-running European probe into the same practices.

U.S. rivals continue to complain to regulators about some of Google's search and advertising practices. Meanwhile, Google may face a new antitrust fight, as regulators probe how Google manages its Android mobile-operating system.

An FTC staff report in 2012 detailed several ways in which Google appeared to have altered search results to favor its own services, although staffers in the agency's bureau of competition didn't recommend filing suit over those issues, The Wall Street Journal reported Thursday. The commission concluded its investigation in early 2013 without taking action.

Google executives have long argued that their responsibility is to provide relevant search results, not promote websites, and if users don't like those results there are other search engines "just a click away."

Following the FTC's decision, Google's rivals turned their attention to Europe, where officials have been investigating similar complaints against Google for five years and have rejected three Google settlement proposals. European Commission antitrust officials are expected to file formal charges against Google about its search practices, perhaps as soon as next month.

Regulators in Argentina, Brazil, Canada, Taiwan and India also are investigating Google's business practices, according to the company's annual financial filing. Until now, though, Google has largely beaten back regulatory reviews of its business practices; in 2014, attorneys general in Texas and Ohio closed investigations.

One EU lawmaker said Friday that commission officials should consider the newly revealed evidence from the U.S. case in weighing charges against Google. "This new... evidence is crucial and could not come at better time," said Ramon Tremosa I Balcells, a lawmaker who represents the Spanish region of Catalonia.

Google Executive Chairman Eric Schmidt on Friday declined to comment on the European investigation or the potential impact of the U.S. disclosures. "At end of the day, the FTC commission made their decision and we agree with that," Mr. Schmidt said in an interview.

Google rivals haven't let up on the search issue. Local-services guide Yelp Inc. and Microsoft Corp. have been particularly active behind the scenes, trying to coordinate opposition to the search giant. Yelp last year launched a website, FocusOnTheUser.eu, that charges Google with favoring its own services in search results and asks website visitors to contact European legislators. The company may be preparing to air similar objections in the U.S. A Yelp executive has registered the ".com" version of the same website, where today a message says the website is "coming soon."

But some observers think the complaints are misplaced. Danny Sullivan, the founding editor of Search Engine Land and a close Google watcher, says criticizing Google for favoring its own services is "a waste of time, like complaining that one TV network doesn't favor another TV network's show enough."

Beyond search, other complaints loom about Google's business practices. In Europe, antitrust regulators have begun an inquiry into whether Google improperly requires the makers of devices that use its Android mobile-operating system to use certain Google services. Google makes Android available free to makers of smartphones and tablets as a way to deliver services like search and YouTube, which generate advertising revenue, and the Play Store, where Google makes money selling apps and games.

Google rivals including Microsoft and Oracle Corp. last year filed a formal complaint with the European Commission, claiming that makers of Android devices that want popular Google apps, including Maps, are required to preload a suite of Google mobile services and give them prominent placement.

The Wall Street Journal first reported secret contracts that Google had drawn up laying out those requirements.

Android powers 65% of smartphones in Western Europe, according to Strategy Analytics, slightly lower than its global market share. U.S. regulators are not known to have looked closely at Android.

Mr. Sullivan, while skeptical of the antitrust claims around search, says Google "deserves attention" from antitrust regulators on its Android dealings. "I think that's much harder to defend," he says.

Google has another victory to point to. A Google spokesman said on Friday that the company was informed last year by the FTC that the Commission had closed an investigation, first reported in 2013, into its display advertising practices.

Tom Fairless contributed to this article.

Write to Tom Fairless at tom.fairless@wsj.com

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