Australian telecoms giant Optus on Monday said personal information and at least one valid form of identification of about 1.2 million customers was compromised in one of the biggest cyber breaches the country has faced, Reuters reports.

The breach last month by an anonymous online account, which affected 10 million customers, equivalent to around 40% of Australia’s population, attracted harsh criticism from the government.

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Optus said it has informed the affected customers about the data breach after the Australian government urged it to speed up its notification to 10,200 customers whose personal information was made public.

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