WASHINGTON (AP) - The U.S. Department of Justice opened a sweeping antitrust investigation of major technology companies and whether their online platforms have hurt competition, suppressed innovation or otherwise harmed consumers.

It said the probe will take into account “widespread concerns” about social media, search engines and online retail services. Its antitrust division is seeking information from the public, including those in the tech industry.

“Without the discipline of meaningful market-based competition, digital platforms may act in ways that are not responsive to consumer demands,” Makan Delrahim, the department’s chief antitrust officer, said in a statement. “The Department’s antitrust review will explore these important issues.”

The terse but momentous announcement follows months of concern in Congress and elsewhere over the sway of firms like Google, Facebook and Amazon. Lawmakers and Democratic presidential candidates have called for stricter regulation or even breakups of the big tech companies , which have drawn intense scrutiny following a series of scandals that compromised users’ privacy.

Facebook may soon face a significant judgment from the Federal Trade Commission over its privacy practices, one that will reportedly include a $5 billion fine and impose other limits on its operations. The FTC also reportedly plans to hand Google a multimillion dollar fine over its handling of children’s information on YouTube. Europe has investigated and fined several major tech companies over the past several years.

“It seems like the nation’s law enforcement agencies are finally waking up to the threat posed by big tech,” said Stacy Mitchell of the Institute for Local Self-Reliance, which has criticized Amazon for stifling independent businesses. Mitchell testified at a House hearing last week.

President Donald Trump also has repeatedly criticized the big tech companies by name in recent months. He frequently asserts, without evidence, that they are biased against him and conservatives in general.

But Big Tech could also present a difficult target, as current interpretations of antitrust law don’t obviously apply to companies offering inexpensive goods or free online services. The Justice Department did not name specific companies in its announcement.

The Justice investigation mirrors a bipartisan probe of Big Tech undertaken by the House Judiciary subcommittee on antitrust. Its chairman, Rep. David Cicilline, a Rhode Island Democrat, has sharply criticized the conduct of Silicon Valley giants and said legislative or regulatory changes may be needed. He has called breaking up the companies a last resort.

Major tech companies already facing that congressional scrutiny declined to comment on the Justice Department’s probe. Amazon and Facebook had no comment. Apple and Google referred inquiries to public statements by their executives.

Shares of Facebook, Amazon and Apple were down slightly in after-hours trading.

Traditional antitrust law focuses on dominant businesses that harm consumers, typically defined as price-gouging and similar behaviors. But many tech companies offer free products that are paid for by a largely invisible trade in the personal data gleaned from those services. Others like Amazon offer consistently low prices on a wide array of merchandise.

“That is going to be a tough one for (regulators) to prove,” said University of Pennsylvania law professor Herbert Hovenkamp.

Beyond that, the companies could face scrutiny for buying up smaller rivals that might be a threat to their business. Last week, Cicilline accused industry giants of creating a “startup kill zone” to insulate them from competition.

For instance, Google bought YouTube in 2006 when it was still a fledging video site struggling to survive an onslaught of copyright infringement lawsuits, and acquired the technology for its now-dominant Android software for smartphones in an even smaller deal. Facebook snapped up Instagram - now the fastest-growing part of its business - in its infancy, and Apple bought the technology powering its ubiquitous Siri assistant.

The Trump-era Justice Department has already tried to push the bounds of antitrust law, albeit unsuccessfully. The government sued to block AT&T;’s acquisition of Time Warner, arguing that the combined company could hike prices for programming, to consumers’ detriment, but lost the case both in lower court and on appeal.

In his January confirmation hearings, Attorney General William Barr acknowledged curiosity about how Silicon Valley giants grew so huge “under the nose” of antitrust enforcers. “You know, you can win that place in the marketplace without violating the antitrust laws,” he said. “But I want to find out more about that dynamic.

Trump has been a fierce critic of AT&T;, which owns CNN, in addition to many large tech companies. At various times, he has publicly criticized Google, Facebook, Apple and Amazon for allegedly shady, biased or unpatriotic behavior.

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Ortutay reported from San Francisco. AP technology reporters Michael Liedtke and Rachel Lerman contributed from San Francisco. AP Technology reporter Matt O’Brien reported from Providence, Rhode Island.

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