Shortly after a breach was reported, Britain’s Royal Mail temporarily stopped access to its click-and-drop website.

“We fully understand and apologize for the inconvenience caused by this. Our engineers are working as hard as possible to get the site back up and running as expected,” it said.

However, owners of the mail service have so far no details of how many customers’ data was compromised and how long it might take to bring the website back online.

The company’s click-and-drop website allows customers to pay for postage online, print labels, and track parcels and posts once they have been dropped off.