Chaos engulfed Hong Kong's financial heart on Saturday night as police fired tear gas and water cannon at petrol bomb-throwing protesters, who defied a ban on rallying - and mounting threats from China - to take to the streets for a 13th straight weekend. Police had banned the demonstration on security grounds and on Friday arrested several key activists and legislators in a dragnet on pro-democracy figures. But Saturday afternoon, large crowds - many in their signature black T-shirts and under a colourful canopy of umbrellas - defied the order to snake through Hong Kong island, blocking roads and chanting 'reclaim Hong Kong, revolution of our times'. Protesters set fire to a large roadblock near Hong Kong police headquarters, sending billows of black smoke into the night sky. 🔥 #HK