Lamb's statement came during her weekly press conference, which coincided with the anniversary of the first protest against a controversial bill that would allow people to be extradited to mainland China.
In recent weeks, protests in the city have flared up again, this time over a new national security law for Hong Kong, which, among other things, makes it illegal to engage in rioting and terrorism. From Beijing, there have been rumors during the year that protesters in Hong Kong have devoted themselves to "terrorism".