A suspected personal data breach involving millions of Malaysians is a national security concern if reports about the matter were true, said Deputy Home Minister Nur Jazlan Mohamed.

"Computer network breaches are always a national security risk.

"Collusion between criminals and staff who look after the (personal data) system is a criminal act and a national security risk," Nur Jazlan told Malaysiakini.

The MCMC and police are currently investigating the alleged breach and sale of the data, which was first highlighted by Lowyat.net.

The technology portal described it as possibly one of the largest breaches in the country's history.

In its report on Thursday, the portal said personal data, including 50 million entries from various telcos, were being sold online...