In a statement, ASAE revealed that the detainees were caught in the act of selling tickets, costing 90 and 150 euros, at 250 and 350 euros.

One of the detainees has already been taken to court and sentenced to a six-month suspended prison sentence and a €500 fine.

ASAE warns consumers not to buy tickets "above their official value", as this is a crime of speculation.

The entity also pointed out that since last week it has been developing "an investigation and surveillance operation within the scope of speculation, aimed at the online sale of Coldplay concert tickets".