Hongkong Post said today that Police have initiated investigation into an incident involving an unauthorised party cyberattacking the EC-Ship system with countless attempts at midnight on July 20 and the following day to access and retrieve information through the system's address book function.

Hongkong Post has notified all affected account holders by email, reminding them to remain vigilant and immediately inform people in their address books of the incident.

The services concerned have resumed normal and account holders can continue to use the services, it added.

For enquiries, call 2921 2222.