The Hong Kong and Macao Affairs Office of the State Council on Monday strongly condemned radicals who threw petrol bombs at police officers Sunday night.

Yang Guang, spokesman for the HKMAO, said Hong Kong's radical protesters repeatedly attacking police officers in the past few days have committed serious violent crimes and have begun to show "signs of terrorism".

He said a very small number of thugs hurled petrol bombs at police officers at the police stations in Cheung Sha Wan, Tsim Sha Tsui and Wan Chai on Sunday night, causing burn injuries to a police officer.

"We express our strong indignation and condemnation of this sinister, reckless and serious crime," he said.

In the past few days, Hong Kong's radical protesters have repeatedly attacked police officers with extremely dangerous tools, which brutally violate the rule of law and social order in Hong Kong, seriously threaten the lives of Hong Kong citizens and challenge Hong Kong's prosperity and stability, Yang said.

He said such violent crimes should be "resolutely cracked down on" in accordance with the law, and the HKMAO firmly supports Hong Kong police enforcing the law and bringing criminals to justice as soon as possible.

Yang called Hong Kong police force "the backbone" in maintaining Hong Kong's social security and the rule of law.

They have been dedicated to their duties in accordance with the law over the past two months and their contributions to restraining the riots are obvious to all and have won praise and high respect from all those who love peace and stability, he said. 

"Hong Kong has reached a critical juncture," he said, adding that all those who care about Hong Kong's future should step up firmly to stop the violence and restore order.