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Hong Kong police said on Monday they arrested 36 people, the youngest aged 12, after violence during anti-government demonstrations escalated as protesters hurled Molotov cocktails at security forces who responded with water cannon and tear gas.

Sunday’s protests saw some of the fiercest clashes yet between police and demonstrators since violence escalated in mid-June over a now-suspended extradition bill that would have allowed Hong Kong people to be sent to mainland China for trial.

Police fired water cannon and volleys of tear gas in running battles with brick-throwing protesters on Sunday, the second day of violent clashes in the Chinese-ruled city.

Six officers drew their pistols and one officer fired a warning shot into the air, police said in a statement.

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WATCH: Hong Kong police fire water cannons, tear gas as protesters take over streets

3:32 Hong Kong police fire water cannons, tear gas as protesters take over streets Hong Kong police fire water cannons, tear gas as protesters take over streets

“The escalating illegal and violent acts of radical protesters are not only outrageous, they also push Hong Kong to the verge of a very dangerous situation,” the government said in a statement.

More demonstrations are planned in the days and weeks ahead, including a rally at Hong Kong’s Cathay Pacific Airways headquarters on Wednesday to protest against perceived “white terror,” a common expression to describe anonymous acts that create a climate of fear.

READ MORE: Cathay Pacific CEO resigns as Hong Kong tensions lead to Beijing pressure

Cathay has emerged as the biggest corporate casualty of the protests after China demanded it suspend staff involved in, or who support, the anti-government demonstrations that have plunged the former British colony into a political crisis.

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Protesters once again adopted cat-and-mouse tactics late in the evening, moving swiftly to locations across the former British colony, where they set up barricades to block some roads, following a largely peaceful rally earlier in the day.

Police said they arrested 29 men and seven women, aged 12 to 48, for offenses including unlawful assembly, possession of offensive weapons and assaulting police officers.

The clashes on Saturday and Sunday marked a return to unrest after days of calmer demonstrations. The protests, which escalated in June over a now-suspended extradition bill, have rocked Hong Kong for three months, occasionally causing serious disruption including forcing the closure of the airport.

WATCH: Hong Kong police seen dragging protester and beating him with batons

0:32 Hong Kong police seen dragging protester and beating him with batons Hong Kong police seen dragging protester and beating him with batons

The city, a major Asian financial center, is facing its biggest political crisis since the handover of power from British rule in 1997.

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Protesters say they are fighting the erosion of the “one country, two systems” arrangement under which Hong Kong returned to China with the promise of continued freedoms, not enjoyed on the mainland, for 50 years.