At least 29 people were arrested for participating in a pro-democracy protest march in Hong Kong which led to violent clashes between police and the demonstrators, according to authorities on Sunday.

The first day of the 12th consecutive weekend of protests ended on Saturday with the arrest of 19 man and 10 women, aged between 17 and 52, Efe news reported.

They have been accused of offences including unlawful assembly, possession of offensive weapons and assaulting police officers, according to the police statement.

“Some radical protesters deviated from the original route and obstructed roads, damaging lamp-posts and assaulting police officers. Police strongly condemn the protesters’ behaviours,” the police said in a statement.

The police alleged that a group of protesters set up barricades to stop traffic and “used electric saws to damage a number of smart lamp-posts on Sheung Yuet Road, posing a serious threat to the safety of people at scene and road users”.

Last month, Thousands of pro-democracy protesters defied a police ban and began marching through Hong Kong a day after riot-police fired rubber bullets and tear gas in the latest violent confrontation to plunge the financial hub deeper into crisis.

Huge crowds gathered in the heart of the city’s commercial district after police gave permission for a static protest in a park but banned a proposed march through the city.

The demonstrations were triggered by a controversial bill which would have allowed extraditions to mainland China, but have evolved into a call for wider democratic reforms and a halt to sliding freedoms.