Elon Musk made a last-minute attempt to buy DeepMind before Google finalized its $500 million deal for the AI lab a decade ago because he feared the search giant couldn't be trusted to create advanced AI, according to a new report.

Axar.az reports that the billionaire made the bid for the London-based AI lab towards the end of 2013 while raising concerns about how Google's then-CEO Larry Page would develop AI, according to the Wall Street Journal, which cited people familiar with the talks and Musk's thinking. Google announced it was buying DeepMind in January 2014.

Musk's plans to buy DeepMind were informal and didn't reach DeepMind's board, the Journal reported.