Children's names, pictures and addresses stolen in nursery chain hack
Hackers say they have stolen the pictures, names and addresses of around 8,000 children from the Kido nursery chain.
A group of cyber criminals says it is using the highly sensitive information to demand a ransom from the company, which has 18 sites in and around London, with more in the US and India.
The criminals say they also have information about the children's parents and carers as well as safeguarding notes.
They claim to have contacted some parents by phone as part of their extortion tactics.
The BBC has contacted Kido for comment. It is yet to confirm the hackers' claims.
But an employee at one of the nurseries confirmed they have been notified of a data breach.