An unsecured database on the dark web left the personal information of more than 267 million Facebook users, mostly in the U.S., exposed.

Although the database, discovered by security researcher Bob Diachenko and Comparitech and traced to Vietnam, is now inaccessible, it laid bare names, phone numbers, timestamps and Facebook IDs and that information also appears on a hacker forum.

“Diachenko believes the trove of data is most likely the result of an illegal scraping operation or Facebook API abuse by criminals in Vietnam,” Paul Bischoff, privacy advocate at Comparitech, wrote in a blog post, noting that “the database was exposed for nearly two weeks before access was removed.”

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