Hong Kong Police warned violence will "escalate" further on China's National Day, October 1, as more "terrorism-like" protests were planned by radical protesters. 

"According to our intelligence, some core radical protesters were mulling on different kinds of attacks on October 1 including appealing on the internet to kill police officers, disguise as officers and kill people, set fires in shopping malls and recruit suicidal bombers," Tse Chun-chung, chief superintendent of the Hong Kong Police Public Relations Branch, said at Monday's media briefing.

"The scale, depth and impact of some core radical protesters are growing bigger and the violent situation in Hong Kong is deteriorating over the past three months," Tse told reporters. "It's getting closer to terrorism acts."

However, the police also expressed its confidence and ability to handle every situation that could happen on Tuesday, saying that "we have done everything we can to prepare."

The police also appealed to residents to stay alert on October 1 while going out, and to stay away from any illegal events.

Speaking at the media briefing, police also updated the number of arrests that have been made over the weekend, saying a number of 11 people, including eight males and three females, were arrested on Saturday, while 146 people consisting of 118 males and 28 females were detained on Sunday for charges including illegal gathering and assaulting officers.

In a statement published Monday on its official website, the police reiterated its strong condemnation and zero tolerance towards the escalated violent acts that have seriously threatened the safety of police officers and other members of the public in the past month.

"Police strongly condemn radical protesters for their violent acts. Police will continue to take resolute enforcement action so as to safeguard the city's public safety and bring all lawbreakers to justice," said the statement.