(Bloomberg) -- Yahoo! Inc., the largest U.S. Web portal, said it’s investigating claims that a hacker is offering to sell user account details stolen in a data breach.

The same hacker who previously sold data taken from LinkedIn and MySpace has posted information from 200 million Yahoo accounts on a dark web marketplace, Motherboard reported yesterday. The data up for sale includes user names, scrambled passwords and birth dates. The stolen information being offered is most likely from 2012, Motherboard reported, citing the hacker, who uses the name Peace.

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