A protester carrying a defaced Chinese national flag is blocked by a police officer during a march to mourn the death of Nobel laureate Liu Xiaobo, in Hong Kong, July 15, 2017. A court in Dali, China, on August 3, 2017, sentenced journalist Lu Yuyu to four years in prison for his work documenting protests on social media. (Reuters/Bobby Yip)
A protester carrying a defaced Chinese national flag is blocked by a police officer during a march to mourn the death of Nobel laureate Liu Xiaobo, in Hong Kong, July 15, 2017. A court in Dali, China, on August 3, 2017, sentenced journalist Lu Yuyu to four years in prison for his work documenting protests on social media. (Reuters/Bobby Yip)

China sentences journalist Lu Yuyu to four years in prison