The pilot of a small plane that crashed into Beijing's tallest building was suffering from "chronic insomnia and anxiety," authorities said Thursday.

Civilian aircraft penetrated Beijing’s highly militarised airspace to collide with Citic Tower, the capital’s tallest skyscraper

Chinese authorities say the pilot who crashed a small plane into Beijing's tallest building last week wrote about “ending his life” in his diary.

The pilot who died after crashing a small plane into Beijing's tallest skyscraper, injuring 13 people, had mental health issues and had written about suicide in his diary,…