Optus says over 2 million customers had their personal identification documents compromised by hackers, while some international victims say they feel unsupported.

Optus chief executive Kelly Bayer Rosmarin has appeared in a video message from the company in which she says approximately 1.2 million customers had at least one number from a current and valid form of identification, and personal information, compromised.

Approximately 900,000 other customers have had numbers relating to expired IDs compromised, as well as personal information.

Another 7.7 million customers did not have ID documents compromised, but had information such as email addresses, dates of birth and phone numbers exposed.

“We are disappointed even one customer's information could be accessed,” Ms Bayer Rosmarin said.

“We are deeply, deeply sorry that this could occur, especially because we genuinely care about safeguarding out customers information and we invest millions of dollars and we have teams of people whose job it is to prevent something like this happening.”

Consulting company Deloitte has been brought in to run an independent external review of the data breach, including scrutiny of Optus’s security systems, controls and processes.

“The review was recommended by Optus Chief Executive Officer, Kelly Bayer Rosmarin, and was supported unanimously by the Singtel Board, which has been closely monitoring the situation with management since the incident came to light,” Optus said in a statement.

The Federal Government says it will urgently review privacy laws in the wake of the leak.

Meanwhile, Optus customers who signed up using international identification say they have been left out of the attempts to help. 

Optus says it is “engaging constructively with the relevant overseas agencies to determine the impact on and what actions, if any, should be taken by customers”.