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EU Deepens Antitrust Investigation Into Google’s Practices

BRUSSELS—The European Union is stepping up its probe into allegations that Google GOOG -5.31 % abuses its dominance in advertising contracts with website operators and copies content from rival websites, in a further sign that the U.S. search giant’s travails with Europe’s antitrust regulator are far from over.

The European Commission, the bloc’s competition watchdog, has sent out questionnaires to companies requesting more detailed information into Google’s business practices in those areas, according to two documents seen by The Wall Street Journal.

The EU has previously flagged its concerns about the practices cited in the questionnaires, which follow a formal complaint in April that charged the company with skewing results to favor its comparison-shopping services.

In one of the questionnaires inquiring about “exclusivity obligations”—whether Google prevents or obstructs website operators from placing ads on their websites that compete with Google’s advertising business—the commission asks companies to update responses they made about the issue in 2010 and to provide a copy of all their advertising agreements with Google over the last four years.

A separate questionnaire, investigating the...