Most of the platforms belonged to local Chinese firms, and it was not immediately clear why Tripadvisor — which features reviews of hotels and holiday destinations — was caught up in the crackdown. The Massachusetts-based company said in a statement that it was "not in a position to comment at this time."
As of Tuesday afternoon, Tripadvisor's website was still accessible in China.
Chinese regulators said the apps they removed were the first of many that would be taken down in a wide-ranging "clean-up" of online content that started last month. The campaign is being held in accordance with several Chinese laws, and is intended to wipe out content related to illegal activity, including obscenity, pornography, prostitution, violence, fraud or gambling, according to authorities.