Via SCMP:
Thousands of anti-government protesters crippled Hong Kong International Airport on Monday and forced the cancellation of all flights in an unprecedented disruption, even as Beijing raised the stakes by warning that escalating protest violence against police in particular was displaying “signs of terrorism”.
Air travel was thrown into chaos as protesters changed tactics to go beyond the arrival hall and swarm over the departure hall to prevent passengers from checking in or clearing security, forcing the cancellation of all flights in and out of the city.