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National Security Education Day falls on 15 April. A speech was delivered under the national flag on 10 April to highlight the theme of National Security Education Day. All students watched an educational video about National Security on 15 April. On top of that, on Saturday 13 April, students, Immigration Department Youth Leaders Corps and teachers joined the open day held by the Immigration Service Institute of Training and Development. Participants took part in a series of interactive activities in order to raise the awareness of national security and understand more about the duties of the Immigration Department in maintaining and implementing the principle of "one country, two systems", safeguarding national security, and serving Hong Kong residents, including those outside Hong Kong.