Educational toy maker VTech has said 11.6 million accounts were compromised in a cyberattack last month, including those of 6.4 million children.
The total number of accounts affected is nearly double that reported last week by the security news site Motherboard, which interviewed a hacker who claimed credit for the breach.
Most of the account holders were in the U.S., including 2.2 million parents and 2.8 million children, VTech said Wednesday in Hong Kong, where the company is based. France, the U.K., Germany and Canada round out the top five countries hit, VTech said in an updated FAQ.
Data breaches have been become a top worry as cybercriminals and hackers probe online systems for weaknesses, resulting in massive breaches of payment card systems, health care data and U.S. government personnel records.
VTech's breach stands out because it affected millions of children. The profile data leaked included their names, genders and birth dates.