Malaysia is investigating an alleged attempt to sell the data of more than 46 million mobile phone subscribers online, in what appears to be one of the largest leaks of customer data in Asia.

The massive data breach, believed to affect almost the entire population of Malaysia, was first reported last month by, a local technology news website. The website said it had received a tip-off that someone was trying to sell huge databases of personal information on its forums.

The country’s internet regulator, the Malaysian Communications and Multimedia Commission (MCMC), was looking into the matter with the police, Communications and Multimedia Minister Salleh Said Keruak said on Wednesday.

“We have identified several potential sources of the leak and we should be able to complete the probe soon,” Salleh told reporters at parliament.

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