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The Australian unit of Singapore Telecommunications has been hit by a major cyberattack.

The dark web and a number of other forums are being monitored by federal police as concerns mount about the scale of the data breach and the millions of customers that may have been affected.

SingTel said in a statement to the Singapore Exchange that personal information including names, birthdates, phone numbers and email addresses may have been exposed. The addresses and identification document details of a small number of customers may have been exposed by the attack.

There are fears about theft of data after an alleged threat was made by hackers to sell millions of customers' data There is a post that has not been verified.

The cyber attack may have exposed customer data.

According to the company, it is in the process of contacting individuals that have had their personal information directly impacted and is working with relevant authorities. The attack is likely to cause a number of claims and scam from criminals who want to benefit financially, according to a company spokesman.

The financial details of no one have been compromised.

The Australian Federal Police would not hesitate to take action against individuals if they were found to have broken the law.