High street retailer WH Smith has said it has been the target of a cyber attack which has seen hackers access company data.
It added that hackers had also been able to access information about current and former employees of the company.
A spokesperson for WH Smith said: “Upon becoming aware of the incident, we immediately launched an investigation, engaged specialist support services and implemented our incident response plans, which included notifying the relevant authorities.
“WH Smith takes the issue of cyber security extremely seriously and investigations into the incident are ongoing.
“We are notifying all affected colleagues and have put measures in place to support them.”
It said the hack has not impacted its trading activities and stressed its website, customer accounts and customer databases are on unaffected separate systems.