The U.S. Department of Justice is gearing up for an investigation of Alphabet Inc.'s (GOOGL - Get Report) (GOOG - Get Report) Google unit, according to a published report late Friday.

The probe will examine the company's practices in search and other businesses, The Wall Street Journal reported, citing unnamed people familiar with the matter.

Google was fined $1.7 billion earlier this year by European regulators for antitrust violations in the online advertising market.

It faces two other multi-billion dollar fines from European regulatory agencies for abusing its control of the Android operating system and for favoring its shopping service over others. All the penalties have been appealed.

A Federal Trade Commission probe of Google ended in 2013, with no action against the company.

Shares of Alphabet fell $14.91 to end at $1,106.50 Friday.

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