Marriott hotel Palm trees stand in front of the Marina Del Rey Marriott hotel in Marina Del Rey, California. Marriott's statement indicates the hacking was going on years before the company acquired Starwood in a deal valued at about $13.6 billion that closed in September 2016. (Photo:Patrick T. Fallon/Bloomberg)

Marriott International Inc. said it's investigating a hack of the guest reservation database at its Starwood unit that may be one of the biggest such breaches in corporate history. Marriott shares slumped as much as 6.9%.

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