Authorities say the pilot, identified as Liu, wrote about "ending his life" and suffered chronic insomnia and anxiety, revelations that come as investigators continue their probe.Investigators report Liu flew a two-seater light aircraft from Pinggu, deviated from his filed route, lost contact with controllers and struck the CITIC Tower (China Zun), killing himself and injuring 13 bystanders; none of the injuries are life-threatening.Officials are reviewing
Liu's medical certification and pilot licenses, have set security cordons and removed social-media discussion, and say the crash exposed gaps in airspace detection that will prompt tighter oversight after President
Xi Jinping urged improved risk prevention.