Royal Mail has asked customers to not send items abroad until "further notice" following a cyber attack.
The delivery giant said it is continuing to experience "severe service disruption" following a "cyber incident" - however, the group has not provided further details on the issue.
In a statement, Royal Mail said: "To support faster recovery when our service is restored and to prevent a build-up of export items in our network, we're asking customers not to post international items until further notice.