The US has put China's top search engine Baidu on a list of "notorious markets" for counterfeit and pirated goods.
The US Trade Representative (USTR) accused Baidu of steering consumers to third-party websites where pirated material is hosted.
Baidu is the most-visited website in China and among the top 10 in the world, USTR said.
Critics accuse China of not protecting intellectual property rights.
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