A 21 year old man from Berkshire has been arrested in connection with the investigation surrounding the theft of data from toy manufacturer Vtech.
The recent attack saw hackers gain access to customer details and pictures of children who used its internet-connected devices.
Data was stolen from the company’s ‘Learning Lodge’ app, a gateway for customers to download games, e-books and other content on to their Vtech devices.
As well as the customer details, the hackers reportedly stole photos and chat logs from VTech's Kid Connect service which allows adults to chat with their children using a VTech tablet.
The suspect was detained this morning in Bracknell, Berkshire, the South East Regional Organised Crime Unit (Serocu) said in a statement.
He was held on suspicion of ‘unauthorised access to computer to facilitate the commission of an offence’ and ‘causing a computer to perform a function to secure/enable unauthorised access to a program/data’.
A number of electronic items were also seized by investigators.
Craig Jones, head of the cyber-crime unit at Serocu, said: "Cyber criminality is affecting more and more businesses around the world and we continue to work with our partners to thoroughly investigate often very complex cases.
"We are still at the early stages of the investigation and there is still much work to be done. We will continue to work closely with our partners to identify those who commit offences and hold them to account.”
It is thought that approximately five million customers were affected by the attack including those from the UK, US, France and China.
The attorney-generals of Connecticut and Illinois in the US are also probing the breach.
The National Crime Agency recently said that the average age of suspected cyber attackers has now fallen to just 17.