A 66-year-old pilot identified as Liu deliberately flies a small plane into the 109-story CITIC Tower in Chaoyang, killing himself and injuring 13 bystanders.Authorities say Liu took off from a northeastern Beijing general aviation airport, traveled briefly with a companion, then deviated from his filed flight path, lost contact with controllers and struck the skyscraper; entries in his personal journal record chronic insomnia, anxiety and repeated suicidal intent.Emergency response teams secure the Central Business District, state-controlled media initially remove social media posts and delay public acknowledgment, and investigators review the flight path, maintenance records and whether airspace controls at general aviation fields need tightening.