The pilot who flew a small plane into Beijing's tallest building last week wrote in his diary about “ending his life,” authorities in China say.Their investigation concluded that the cause of last Friday's crash was “personal reasons,” according to a statement posted on social media by Beijing's Chaoyang district government.The pilot, a 66-year-old man, was killed in the crash and 13 other people were injured. None of the injuries are life-threatening and one of the injured has been discharged, the government statement said.The crash, which happened in a downtown skyscraper district as people were leaving work around 6 p.m., raised questions about security in the Chinese capital. It left a hole in the glass facade of the 108-story CITIC tower, nicknamed the “Zun” building because it mimics the shape of an ancient wine vessel of that name.Damage to the skyscraper after a small plane crashed into it (AP Photo/Ng Han Guan)The Citic Tower, or China Zun, was struck early on June 27, 2026 (Kevin Frayer/Getty Images)The pilot, identified only by the surname Liu, first flew with someone else in the two-seat training plane, then took off on a solo flight from a general aviation airport in the outskirts of Beijing, the Chaoyang statement said. He deviated from the planned flight path and contact with him was lost, it said.Liu had no fixed job, was divorced and lived alone, according to the statement. He had insomnia and anxiety and his diary had multiple references to ending his life, it said.If you are experiencing feelings of distress, or are struggling to cope, you can speak to the Samaritans, in confidence, on 116 123 (UK and ROI), email jo@samaritans.org, or visit the Samaritans website to find details of your nearest branchIf you are based in the USA, and you or someone you know needs mental health assistance right now, call or text 988, or visit 988lifeline.org to access online chat from the 988 Suicide and Crisis Lifeline. This is a free, confidential crisis hotline that is available to everyone 24 hours a day, seven days a week. If you are in another country, you can go to www.befrienders.org to find a helpline near you