The New York Times reports: "President Xi Jinping of China called for more measures to protect stock market investors after meeting with financial regulators, the state news media said on Tuesday, signaling top-level support for a national campaign to crack down on market manipulation and to increase transparency. Xu Xiang, the billionaire owner of a Chinese investment firm who is sometimes compared to Carl Icahn, was detained on suspicion of insider trading on Nov. 1 and has been held incommunicado. In the days since, Chinese government officials appear to have broadened their investigation, amid the adoption of new regulatory measures. China Securities Journal, a semiofficial Chinese publication, said on Tuesday that public security agencies had frozen accounts totaling 4.3 billion renminbi, or about $675 million, that belong to a woman whom the Chinese news media have identified as Mr. Xu's mother."