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A 'bullied' schoolboy was caught on camera flooring one of his alleged tormentors with one punch after being repeatedly challenged to a fight.

The youngster appears to be being followed by a group of children, including one girl, who slaps him around the face, while those nearby goad him.

Several voices can be heard saying: "What are you going to do?" in an apparent challenge to the boy, who appears to be trying to walk away from them.

But as they get closer, the "victim" suddenly unleashes a lightning-fast punch which would not look out of place in a heavyweight bout, sending one boy tumbling backwards onto the ground.

The footage, believed to be filmed in the Merseyside area, was posted to Twitter yesterday, although it is not known when it was filmed or by whom.

(Image: Twitter) (Image: Twitter)

The clip has been retweeted over 4,000 times and liked by over 10,000 social media users.

The person who uploaded it wrote: “Nothing gives me more pleasure than seeing bullies get this treatment."

He draws attention to the fact the boy threatening the youngster doesn't even finish his word before being felled.

He wrote: “I’ll sma... (what I assume was gonna be ‘I’ll smash you’) LEFT CROSS... HEZ... Sleep... screams, bullies videoing instantly cease filming.”

(Image: Twitter)

The 13-second clip shows the group, all wearing school uniform, circling the lone boy with one in particular leading the charge.

She squares up to him and tries to goad him, before landing a slap on his face.

He retreats and resists the temptation to react to her, but then the other boy steps forward and begins to say what sounds like “I’ll smash you”.

He doesn’t even get halfway through saying it though before being sent flying by a thumping left hook which Anthony Joshua would have been proud of.

The boy on th receiving end falls to the floor and his friends gasp and scream: “Oh my god, Callum, Callum.”

(Image: Twitter) (Image: Twitter)

Social media users reacted to the video with sympathy for the picked-on boy who was forced into retaliation, and praised the quality of his punch.

Sean Berry said: “Yes. What a hit son. What a hit.”

Another user said: “Never condone violence, but when it's self preservation and defence you are protected. Perfect timing.”

Rob Hughes said: “I don't like violence but I'd be lying if I said this wasn't a bit pleasing. I don't know the context but those kids don't seem like they're fighting the good fight.

"With a bit of luck neither Callum or his lynch mob will feel quite so emboldened tomorrow.”

Paul Jones said: “I've been that kid. Backing away, being harassed and fearful. The release in standing up for yourself is massive.”

Another user added: “Callum won’t be mouthing off again.”