| WHAT | Hydrogen balloon was exploded in the school opening ceremony in 2023 |
| WHEN – WHERE – WHO | In the morning of Sep 5th, 2023 at the Yen Phu Primary School, Yen Dinh District, Thanh Hoa province, Northern Vietnam |
| WHY – HOW | Balloons are used to decorate the stage on the school opening ceremony. After the program ended, some pupils ran up to the stage to get the ball. At that time, a teacher who was smoking passed by, and the ball exploded. |
| DAMAGED |
|
| LESSON LEARNED |
|
| LINK FOR REF. | Hydrogen balloon was exploded |
