Hong Kong protests

Hong Kong police fire gun and use water cannon on protesters

Images show several other officers also pointed guns at protesters who were chasing them with sticks and poles.

In another first, police deployed water cannon against protesters earlier in the day.

The protests began in the city's Tsuen Wan district and have since spread to the district of Tsim Sha Tsui.

Demonstrations were sparked by an extradition bill but have since morphed into broader anti-government protests, and developments on Sunday mark a serious escalation in the unrest.

Twitter and Facebook remove Chinese accounts

Twitter said it removed 936 accounts it said were being used to “sow political discord in Hong Kong”.

The network said the accounts originated in mainland China and were part of a coordinated attempt to undermine the “legitimacy and political positions of the protest movement”.

Facebook said it had, after being tipped off by Twitter, removed "seven Pages, three Groups and five Facebook accounts.”

Hong Kong protests cripple airport for second day

Squads of riot police arrived shortly before midnight after thousands of demonstrators again flooded the terminal buildings during the day.

Flight departures were brought to a standstill amid scuffles.

At least three men were mobbed inside the airport by protesters.

They were said to be holding identity cards showing they were police officers from mainland China.

Hong Kong police have admitted deploying officers disguised as anti-government protesters during the unrest in the city.