By Diane Bartz and Dan Levine WASHINGTON/SAN FRANCISCO (Reuters) - Google Inc competitors are pushing U.S. antitrust enforcers to investigate allegations the Internet services company unfairly uses its Android system to win online advertising, two people with knowledge of the matter said. A small number of technology companies have complained to the Department of Justice that the Android mobile operating system is anti-competitive, said the sources, who declined to be named to protect business relationships. Google reached a settlement in 2013 with the U.S. Federal Trade Commission over Web search allegations. The meetings between Google critics and regulators predate Wednesday's announcement by the European Union after a five-year probe that Google distorted Web search results to favor its own shopping service.

More...