Hackers say they have stolen the details of more than 600,000 Domino's Pizza customers.

They are threatening to publish the details unless they are paid a sum of around €30,000.

It seems only French and Belgian servers were compromised and no financial details were stolen.

A hacker does claim to have details of customers' favourite toppings though.

The pizza chain opened its first Irish store in 1991 and operates in over 60 countries.