SAN FRANCISCO/FRANKFURT (Reuters) – (This July 22 story was corrected in paragraph four to show Almunia said he would not conduct a formal market test, instead of that he would not consult complainants) European Union antitrust regulators are preparing to step up investigations of Google Incs practices on several fronts and are likely to revise certain terms of a settlement involving its search engine that was proposed earlier this year, the Wall Street Journal reported on Tuesday. Google has been the target of a European Commission investigation since November 2010, when more than a dozen complainants, including Microsoft Corp, accused the company of promoting its own services at their expense. In February, Google agreed to make concessions on how it displays competitors links, striking a deal that ended a three-year antitrust probe and avoided a hefty fine.