Authorities in the U.K. have arrested a 21-year-old man who they believe is responsible for hacking the data of over 6 million children who used VTech electronics.

The suspected hacker is being held on charges of the Computer Misuse Act of 1990, CNet reports.

VTech makes tablets, computers and games aimed at younger audiences.. Its Learning Lodge app store was hit in a cyber attack late last month. This resulted in the release of profiles of 6.4 million children. The attack also caused children's parents' data to be breached.

This is one of many data breaches in recent years, but this one involves children and it is worrisome for authorities.

Parent accounts included names, email addresses, password hints, IP addresses, mailing addresses and download history.

VTech says that child profiles contained less data, just names, gender and birth dates. Parents and authorities are alarmed that this amount of data was able to be accessed by the suspected hacker. It is unknown whether photos, video chats or photos from children's accounts were stolen.

Authorities say they have seized several electronic devices from the suspect. The Cyber Crime Unit involved in the investigation worked hard with other agencies to find the suspect.

Children and parents from the U.S., France, the U.K. and Germany were most affected by the data compromise. Authorities in Hong Kong, the U.S. and the U.K. are partnering to investigate the case. VTech is a Hong Kong-based company.

Craig Jones, head of the Cyber Crime Unit, is working hard on the case and says it will be a tough task.

Jones stated: "Cyber criminality is affecting more and more business 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."