China will have jurisdiction over “some extremely rare” national security cases in Hong Kong under a new law to be imposed on the semi-autonomous city, a senior official said Monday. The revelation came as thousands of Hong Kongers gathered on Monday evening on the anniversary of the death of a man during last year’s pro-democracy protests. Beijing has signalled the new security law — which will bypass the city’s legislature — needs to be passed quickly to end such protests, which have gained fresh momentum since the measure was announced.