Hong Kong police have used water cannon against anti-government protesters for the first time during a second straight day of demonstrations.
There have been skirmishes between activists and officers following a pro-democracy march in an area known as the New Territories where tens of thousands took to the streets.
A large crowd then attended a rally in a park but another group of protesters took over a main street, putting up barricades with traffic barriers and cones.
Police tried to disperse them by firing tear gas but protesters reacted by throwing bricks and other objects towards the officers.
The violence came a day after similar clashes in the Kowloon Bay district where authorities arrested 29 people for offences including unlawful assembly, possession of offensive weapons and assaulting police officers.
According to the South China Morning Post, the custom-built French trucks have 15 high-pressure cannons.
Two cannons on the roof can fire more than 1,200 litres of water a minute over a distance of 50 metres. The water can be mixed with tear gas or liquid dye as well.
According to guidelines, the cannons should only be aimed at the lower limbs of the protesters.
An assistant commissioner of police overseeing operations is allowed to authorise deployment of the water cannon after assessing threats.
The trucks arrived in the city in May last year.