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People attend a themed activity on national security at Victoria Park in the Hong Kong Special Administrative Region, April 15, 2024. (Photo: China News Service/Hou Yu)
April 15 this year marks the fourth National Security Education Day in Hong Kong, and various activities were held to mark the annual event.
![](http://www.ecns.cn/hd/2024/04/16/22b589ab688d459ab79d1117b8978ffa.jpg)
A poster is hung to mark the fourth National Security Education Day in the Hong Kong Special Administrative Region, April 15, 2024. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2024/04/16/a347a56525484911a813a505c1c1a4b0.jpg)
A boy plays a game during a themed activity on national security at Victoria Park in the Hong Kong Special Administrative Region, April 15, 2024. (Photo: China News Service/Hou Yu)
![](http://www.ecns.cn/hd/2024/04/16/193461b7f3984cfdb38893bb56a9face.jpg)
An exhibition is held to mark the fourth National Security Education Day at Victoria Park in the Hong Kong Special Administrative Region, April 15, 2024. (Photo: China News Service/Hou Yu)