Hong Kong will hold two more drills later this month at the revamped Huanggang border crossing, with up to 20,000 civil servants involved to test the new immigration clearance gates under “harsher scenarios”, according to the city’s security chief.

Secretary for Security Chris Tang Ping-keung said on Monday that authorities had identified problems such as the lack of notices and benches, as well as crowd congestion at the transport interchange, following two earlier large-scale drills held last Thursday and Saturday on the