WASHINGTON (AP) — The Latest on testimony in Congress by the CEOs of Facebook, Apple, Amazon and Google (all times local):

3:50 p.m.

Amazon founder Jeff Bezos says he can't guarantee that the company isn't accessing seller data to make competing products, an allegation that the company and its executives had previously denied.

His comments came Wednesday during a congressional hearing into the market dominance of four tech giants — Amazon, Google, Facebook and Apple.

Regulators in the U.S. and Europe have been scrutinizing Amazon’s relationship with the businesses that sell on its site and whether the online shopping giant has been using data from the sellers to create its own private-label products.

“We have a policy against using seller specific data to aid our private label business,” said Bezos, in a response to a question from Rep. Pramila Jayapal, a Democrat from Amazon's home state of Washington. “But I can’t guarantee to you that that policy hasn’t been violated.”

A Wall Street Journal article from April quoted Amazon employees who said they did have access to seller data to make competing products, including a car trunk organizer that Amazon copied.

Bezos said he was aware of the article and is still looking into the allegations.

“I’m still not satisfied that we’ve gotten to the bottom of it,” he said.

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3:30 p.m.

Facebook CEO Mark Zuckerberg is again being put on the defensive in a congressional hearing over the social network’s role as a conduit for Russian interference in the 2016 presidential election.

And Rep. Jamie Raskin, a Maryland Democrat, has brought the issue current with concerns that right-wing groups are using Facebook to infiltrate the Black Lives Matter movement and to spread anti-Semitic propaganda.

Zuckerberg says Facebook uses sophisticated technology to intercept hate speech, often before it’s seen on the platform. “It hurts our business,” he said.

Zuckerberg's comments came at hearing that also featured Amazon CEO Jeff Bezos, Apple CEO Tim Cook and Google CEO Sundar Pichai. The CEOs are answering for their companies’ practices as a House panel caps its yearlong investigation of market dominance in the industry.

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2:45 p.m.

Facebook internal company documents are being deployed against CEO Mark Zuckerberg by lawmakers asserting that the company has gobbled up rivals to squelch competition.

Rep. Jerrold Nadler, the Democrat who heads the House Judiciary Committee, told Zuckerberg at a hearing Wednesday that documents obtained from the company “tell a very disturbing story” of Facebook’s acquisition of the Instagram messaging service.

He said the documents show Zuckerberg called Instagram a threat that could “meaningfully hurt” Facebook.

Zuckerberg responded that Facebook viewed Instagram as both a competitor and a “complement” to Facebook’s services, but also acknowledged that it competed with Facebook on photo-sharing. Some critics of Facebook have called for the company to divest Instagram and its WhatsAPP messaging service.

The questioning came at a congressional hearing that also featured Amazon CEO Jeff Bezos, Apple CEO Tim Cook and Google CEO Sundar Pichai.

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2:30 p.m.

The chairman of a Congressional committee investigating the power of major technology companies accused Google of leveraging its dominant search engine to steal ideas and information from other websites and manipulating its results to drive people to its own digital services to boost its profits.

Rep. David Cicilline peppered Google CEO Sundar Pichai with the allegations of abusive behavior while grilling him Wednesday during a hearing that is also putting Amazon CEO Jeff Bezos, Apple CEO Tim Cook and Facebook CEO Mark Zuckerberg on virtual hot seats while answering questions posed through a video stream.

Pichai repeatedly deflected Cicilline’s attacks by asserting that Google tries to provide the most helpful and relevant information to the hundreds of millions of people who use its search engine each day. He said this is part of its effort to keep them coming back instead of defecting to a rival service, such as Microsoft’s Bing.

Pichai struggled to answer one question about whether Google threatened to dump Yelp from its search engine database after the restaurant review site told Google to stop scraping its site for content. Yelp raised that issue about a decade ago before before Pichai became CEO in 2015.