Travelodge is still trying to find out who got into their customer database and snaffled names and email addresses.
The budget chain told the Reg it has asked outside contractors to go through its systems to try and find the culprits.
A spokeswoman said:
In the last 24 hours, we have been conducting a comprehensive investigation to find out why a small group of our customers have received a spam email from a third party to their registered email address. Investigative specialist experts in this field have been working around the clock to methodically eliminate the possible areas of concern. Our current findings have revealed that a small proportion of data contained on one of our marketing databases may have been compromised. This data related to customers names and email addresses only, which has been used for the spam email.
We can further confirm no financial data has been stolen, accessed or compromised.
The breach first emerged on Thursday when customers started getting spam emails to addresses which had only been given to the hotel chain.
The Information Commissioner's Office is investigating but stressed that hacking was primarily a matter for the police – provided Travelodge was taking proper care of the data of course. ®