Singapore, Sept. 27 -- The local authorities are investigating a data breach at home-grown e-commerce cashback platform ShopBack, after the firm made public an incident involving unauthorised access to customers' personal data.

A spokesman for privacy watchdog, the Personal Data Protection Commission, said it has been notified of the incident. "Investigations are ongoing," he added.

In an e-mail to customers on Friday evening seen by The Sunday Times, ShopBack said it became aware of unauthorised access to its systems, which contained customers' personal data, "a few days ago".

It is still investigating what data has been compromised.

"To date, we have no reason to believe that any of your personal data has been misused, however the...