Policemen arrest a protester during a clash at the airport in Hong Kong on Tuesday. Riot police clashed with pro-democracy protesters at Hong Kong's airport late Tuesday night, a chaotic end to a second day of demonstrations that caused mass flight cancellations at the Chinese city's busy transport hub.

Medical staff take part in a protest against police brutality directed against democracy protesters, at a hospital in Hong Kong on Tuesday. Demonstrators have in recent days focused on their demand for an independent inquiry into what they call the police’s abuse of power and negligence. That followed reports and circulating video footage of violent arrests and injuries suffered by protesters. The signs read "I'm a health professional, I strike for Hong Kong."

Travelers make their way through protesters to the departure gates during a demonstration at the Hong Kong International Airport in Hong Kong on Tuesday.

Policemen in riot gear arrest a protester during a demonstration at the airport in Hong Kong on Tuesday.

Protesters stage a sit-in rally at the airport in Hong Kong on Tuesday.

Protesters use luggage trolleys to block the walkway to the departure gates during a demonstration at the airport in Hong Kong on Tuesday.

A protester uses an umbrella to block a surveillance camera during a demonstration at the airport in Hong Kong on Tuesday.

A protester pours water on the head of a detained man who protesters said was a police officer from mainland China, during a demonstration at the airport in Hong Kong on Tuesday.

Protesters use zip ties to detain a man carrying a T-shirt printed with the words "I love police." Protesters claimed he was a police officer from mainland China.

A medical staffer helps a man after he was detained by protesters who claimed was a police officer from mainland China.

In this combination of photos taken on Monday, protesters wear eyepatches during a demonstration at the airport in Hong Kong. Protesters who have occupied Hong Kong International Airport wore bandages over one eye in a sign of solidarity with a comrade who they say was hit with a type of non-lethal ammunition known as a beanbag round.