Hong Kong has been shaken for months by protests, which began as demonstrations against an unpopular bill and have become a broader movement against China’s power.

They have also become more violent and unpredictable. In recent days, they have reached the city’s airport, bringing chaos to an Asian transportation hub known for its efficiency. Protesters seriously disrupted its operations, forcing it to suspend check-ins for two days in a row. Hundreds of flights were canceled, and many passengers were stranded.

[Here’s a guide to what prompted the Hong Kong protests and how they evolved.]

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