Facebook CEO Mark Zuckerberg was the only major technology CEO on Wednesday to confirm that China was stealing from U.S. companies.

During a hearing on Capitol Hill, Apple CEO Tim Cook, Alphabet CEO Sundar Pichai, Amazon CEO Jeff Bezos and Zuckerberg were asked whether they believed the Chinese government was stealing technology from U.S. companies, to which the Facebook CEO said he thinks the probem is “well-documented.”

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Bezos said that while he had reports of technology theft carried out by China, he didn’t have any “personal experience” in the area.

Pichai said he had no firsthand knowledge of technology stolen from Google, but later corrected his statement to say that in 2009 there was a well-publicized cyberattack conducted by groups with origins in the country.

Cook said he knew of no cases specific to Apple’s information.

When asked what could be done by lawmakers