The names and addresses of customers have been leaked to other users of the online retailer.

A number of customers told the BBC that they had received emails from regarding items they had not ordered. The emails contained the names and addresses of other customers that did in fact order the product. Although credit card details were not included on the emails.

"We were alerted to an incident that appears to have affected some customers for a short period of time in the early hours of this morning, and the first thing we'd like to say is that we apologise for any inconvenience our customers have experienced as a result," said.

"We'd like to reassure our customers that the cause of the incident has been identified and resolved. We take these matters very seriously and are now investigating how this incident occurred in the first place, so that we can prevent it happening in the future," the company added. did not say how many customers had been affected.

PC security advice

Broadband speed test

See also: Guardian hack exposes 500,000 job hunters