Europe’s major consumer group BEUC said Wednesday that it feared Internet search engine Google Inc.’s takeover of online ad tracker DoubleClick Inc. would damage European Union privacy rights and limit consumers’ choice of Web content.

Their plea to EU regulators comes after U.S. consumer privacy advocacy groups asked the U.S. Federal Trade Commission to look at how the two companies, when combined, would have access to an unprecedented amount of data on consumers’ Web usage and Internet search habits.