Arts and crafts retailer The Works has been forced to close several stores due to a cyber attack.
The chain today said it had called in cyber security experts after its systems were compromised by hackers last week.
The company, which trades online and from more than 500 stores across the UK and Ireland, said it had shut down access to its data internally and externally after being alerted to the unauthorised access by its security firewall.
This resulted in new stock deliveries to its shops being temporarily suspended and longer delivery times for online orders.
It said store deliveries "are expected to resume imminently" and its normal online service levels are steadily being reintroduced.
Bosses added that the firm does not currently expect the incident to have a "material adverse impact" on its financial position or forecasts.
In a statement, The Works said: "There has been some limited disruption to trading and business operations, including the closure of some stores due to till issues.
"Customers can continue to shop safely at The Works, both in store and online.
"All debit and credit card payment data are processed securely outside the group's systems, via accredited third-party networks, and therefore there is no risk that this payment data has been accessed improperly."
The retailer said it has taken a number of actions after it was alerted to the breach by its security firewall.
The Works has disabled all internal and external access to its systems, including email, while it works with its advisers to evaluate and rectify the situation.
External cyber security experts have also been appointed and are currently completing investigations and recovery work.
The company added that, while payment data has not been compromised, it has not yet established "the full extent to which any other data may have been affected".
It said it has therefore also informed the Information Commissioner's Office.
