(Bloomberg) -- DeepMind, an artificial intelligence company owned by Alphabet Inc., accessed 1.6 million hospital patient records using an inappropriate legal justification, according to a top U.K. government adviser.

The National Data Guardian, Dame Fiona Caldicott, who advises the U.K. Department of Health on patient data privacy, gave the opinion in a letter sent to Stephen Powis, medical director of London’s Royal Free Hospital Trust, on Feb. 20.

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