CNN  — 

A senior Hong Kong official has described the city’s legislative council as a “big crime scene,” just hours after hundreds of masked, mainly young protesters stormed the building, leaving a trail of destruction in their wake.

Graffiti-scrawled slogans, broken glass and strewn debris were just a few of the outward signs of a night which marked an apparent turning point in the city’s weeks-long protest movement against a controversial extradition bill.