Police commissioner Raymond Siu on Saturday said the force will beef up patrols on National Day, although he stayed mum on the exact number of officers expected to be mobilised.

Speaking on a television programme, the police chief noted the threat of terrorist attacks in Hong Kong remained at a moderate level, and there is no specific intelligence suggesting the SAR is likely a target.

Siu refused to disclose how many officers would be mobilised for October 1, saying only that many are going to be on duty to carry out patrols.

He said the force has not received any applications for the holding of National Day rallies, but warned against any illegal acts.

"We cannot let our guard down. There are still some people going underground and using soft resistance tactics to try to incite people to come out. We will closely monitor our intelligence and see whether such acts are happening online. If so, we will act accordingly," Siu said.

On the recent incidents regarding the alleged issuance of exemption certificates for Covid vaccinations without medical consultations, the police chief said both patients and doctors are responsible to ensure medical records provided are valid for such documents.

He added that officers will not hold back in taking law enforcement action.