China has stepped up its scrutiny of journalists with at least two editors and other employees of a major Chinese business news website detained and investigated for suspected extortion, The Wall Street Journal reported, citing state media. State broadcaster China Central Television said the chief editor and deputy editor of the 21st Century Business Herald website were among eight people taken into custody Wednesday. At least two public-relations companies were also facing scrutiny as part of the investigation, CCTV said. The investigation marks the latest instance of police targeting the behavior of the nation’s journalists.