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Cybercriminals have intensified their efforts to steal and sell online passwords, experts warn. The alarm comes after the discovery of online datasets containing billions of exposed account credentials.

The 30 datasets comprised a whopping 16 billion login credentials across multiple platforms, including Apple, Google and Facebook, and were first reported by Cybernews researchers last week.

The exposures were identified over the course of this year by Volodymyr Diachenko, co-founder of the cybersecurity consultancy Security Discovery, and are suspected to be the work of multiple parties.

“This is a collection of various data sets that appeared on my radar since the beginning of the year, but they all share a common structure of URLs, login details and passwords,” Diachenko told CNBC.