Google faced a new antitrust attack from European Union regulators who allege the search engine skews results in its own favor and unfairly restricts rival online advertising platforms.

The European Commission sent the Alphabet Inc. unit two statements of objections Thursday, widening a five-year probe and delaying a threat of fines. It adds to an antitrust complaint over Google's mobile-phone software Android earlier this year.

EU regulators said they have "a broad range of additional evidence and data" to reinforce their view that Google systematically favors its own comparison-shopping service in its general search results. The company's conduct "has weakened or even marginalized competition from its closest rivals," they said in a statement.