On march 4, 2016 (Beijing time), Canyu.org (a pro-democracy and human rights for China website) published an open letter authored by a “loyal communist party member” requesting the Chinese President Xi Jinping to step own http://canyu.org/n110479c6.aspx. On March 8 (also Beijing time), Canyu.org Editor-in-Chief Cai Chu had an interview with Voice of America http://www.voachinese.com/content/voa-news-cai-chu-interview-20160307/3223306.html to discuss about the open letter which requesting President Xi Jinping to step down. Starting March 7, Canyu.org has been attacked by DDoS and it became inaccessible several times, sometimes it lasted more than 24 hours. The attacker even changed the Admin login of the website, but it was fixed by the website technician. On March 15, starting at 5:35 AM, Cai Chu's mobile phone was attacked. He received "No Caller ID" calls every 30 seconds. Every call had two rings and stopped. It started again in every 30 seconds. Only beeps can be heard from the other side. The only way to stop it temporally was turning the phone to airplane mode. As no one was at home from early morning to 6:15 pm on March 15, Cai Chu did not know the home phone situation until 6:15. The home phone had the same ringing every 30 seconds with two rings. Cai Chu’s home phone carrier told him that he could stop the last call by pressing certain buttons and he tried to stop it for 3 times. However, the calls kept on coming in. Obviously the calls were from different numbers maybe generated by a computer. The only way to stop it is to unplug the phone. On March 16 night, when Cai Chu plugged the phone back, the calls started coming in again. So he had to unplug the phone again.