Hong Kong protests: Suspicion after 'triad' attacks

Hong Kong's leader has warned that police will take "all actions necessary" to ensure government offices and schools reopen on Monday.

But tens of thousands of protesters remained on the streets on Saturday night, demanding fully free elections in 2017.

It appears violence on Friday night, when thugs thought to be connected to the city's criminal triad gangs attacked students, has galvanised support for the protests rather than diminishing it.

John Sudworth reports from Hong Kong.