Google Inc., owner of the world’s most popular Internet search engine, faces European antitrust scrutiny after three companies filed complaints about unfair competition.

A UK price-comparison site called Foundem, a French legal search engine called Ejustice.fr and a Microsoft Corp. service called Ciao From Bing, have brought competition complaints to the European Commission, Google said in a blog posting.

Foundem and Ejustice.fr complain that Google downplays their sites in its search results, Google said. Ciao From Bing, a Microsoft unit, complained about Google’s terms and conditions.