Although Hong Kong government has not officially announced such measure, the potential usage of it was actually bought up by one of the highest ranking official

Although Hong Kong government has not officially announced such measure, the potential usage of it was actually bought up by one of the highest ranking official in Hong Kong. You can argue that it was not an official statement made by the government but any statement made by an official of this rank would pose enough concern to the society to the effect of the actual measure he was suggesting to task.