Google will be the target of an antitrust investigation by a broad coalition of state attorneys general set to be announced as early as next week, The Washington Post reported.

According to the Post, more than half of the nation’s state attorneys general will be participating in the Google investigation, though it’s unclear which states are involved.

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An investigation has been rumored for months amid the growing federal scrutiny that Silicon Valley is facing over potential antitrust violations.

A small group of state law enforcers met with Makan Delrahim, head of the Department of Justice’s (DOJ) Antitrust Division, earlier this summer to discuss competition issues in Silicon Valley.

"Google's services help people every day, create more choice for consumers, and support thousands of jobs and small businesses across the country,” a Google spokesman said in a statement. “We continue to work constructively with regulators, including attorneys general, in answering questions about our business and the dynamic technology sector."

The DOJ is also exploring tech giants’ market power for potential antitrust issues, but it’s unclear if the department will be collaborating with the states on their investigation.

The Senate Judiciary subcommittee on antitrust also announced on Tuesday that it would hold a hearing later this month on competition concerns surrounding acquisitions by tech giants.