Story By: John Feng, Sub Editor: Joseph Golder, Agency: Asia Wire Report

Video Credit: AsiaWire

This is the moment a terrified teacher is sent dashing for the door after a teenage prankster threw a smoke bomb at the blackboard before the class was evacuated and police were called in.

The apparent prank took place during a physics and chemistry class at Fu Jen Catholic High School in Taiwan’s south-western city of Chiayi.

The pupil, who has been identified as Li Zongmao, 14, later posted the footage online to a Facebook group before deleting it against amidst a torrent of abuse.

Pictures Credit: AsiaWire

The clip liked more than 20,000 times online and filmed by one of Li’s classmates shows the science lesson well under way and the teacher writing on the blackboard.

In the video, the smoke bomb can be seen flying from the back of the class and hitting the floor by the first row of pupils sitting in front.

Before long, the secondary school children begin frantically running back and forth as blue smoke rises and fills the room.

According to Chen Chi-wei, a disciplinary officer at the school, the teacher handled the incident “calmly” and evacuated the class shortly after.

Chen said: “The pupils had planned to prank the teacher, as some sort of joke.

“They wanted to see the teacher’s reaction and make fun of whatever panic would follow.”

Li has since deleted the footage, but not before he was seen owning up to the prank and bragging about it on Facebook.

He has reportedly apologised for his actions but faces punishment from his school and possibly the authorities too.

“Smoke bombs are a banned item in the school, so he will likely receive a demerit,” Chen said.

Officers investigating the case have revealed smoke bombs are not considered controlled items under Taiwanese law.

However, Li could still be charged with a public order offence.