China challenged the United States Friday to show evidence to support charges that Beijing backed a scheme by Chinese and Taiwanese companies to steal trade secrets from a US-based semiconductor firm.

Watch: China says US should provide 'concrete proof' of espionage

China says US should provide 'concrete proof' of espionage

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Watch: China says US should provide 'concrete proof' of espionage

China says US should provide 'concrete proof' of espionage