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A teenager is in a coma after another lad tugged his testicles as part of a prank that went wrong.

The 17-year-old, who is from Artane in Dublin, suffered cardiac arrest while joking around with other youths.

He passed out after the incident which happened during his lunch-break on Thursday.

Gardai have launched an investigation into the incident.

The boy was on his way back to St David’s CBS off the Malahide Road when he came across people he knew.

It is believed the fifth year student was joking around with the others when somebody jerked his scrotum.

A source close to the family revealed they hope there is no permanent damage.

The source added it wasn’t a savage attack and wasn’t malicious.

A school teacher and one of the youths performed CPR at the scene before the emergency services came which could have saved the teen’s life.

On Friday night the boy was in the ICU ward in Beaumont in a stable condition.

He was in an induced coma and hasn’t woken up yet.

Gardai initially sealed off the area after the incident thinking the boy had been assaulted.