SAN FRANCISCO/FRANKFURT (Reuters) – 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. Competition Commissioner Joaquin Almunia said at the time he would accept Googles concessions without consulting complainants, prompting a furious response.