A 15-year-old boy has been arrested in Northern Ireland in connection with the hack on mobile operator TalkTalk, which put the banking details of millions of people at risk.
The Metropolitan police says that the boy was arrested on suspicion of Computer Misuse Act offences and taken into custody this afternoon.
The arrest came after a search warrant was executed by the Northern Ireland police service, working with the Met's cyber crime unit, at an address in County Antrim.
The boy is being held at a police station ahead of an interview and the search at the property is ongoing.
Last week TalkTalk confirmed that the banking details of over four million consumers may have been stolen following a sustained cyber-attack on its website.
The firm later revealed that it had been contacted by the perpetrators of the fraud demanding a ransom in return for the hacked data and a moratorium on future DDoS attacks.