and did so for "personal reasons", authorities said Thursday. The crash had killed the pilot, officially identified only by his surname Liu, and wounded 13 others. Liu, a 66-year-old Beijing resident, was a divorced freelancer who lived alone, the Chaoyang district government said in a statement, adding Liu's diary contained "multiple expressions of ending his life". "The comprehensive investigation concluded that this was a case of endangering public safety caused by personal reasons," the statement said. One of the injured has been discharged from the hospital, officials said. Videos of the crash at the CITIC Tower had been widely circulated on social media before being scrubbed off the Chinese internet, as authorities investigated what many observers viewed as a huge security breach. The 109-storey CITIC Tower, also known as China Zun, is located just a few kilometres from Zhongnanhai, the Communist Party's headquarters. The building has long been treated by many locals as a lucky charm. But shortly after the crash last Friday, even unrelated photos and memes of the skyscraper were taken down from Chinese social media platforms. (BBC)