(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.

“We are committed to protecting the security of our users’ information and we take any such claim very seriously,” Yahoo said in a statement. “Our security team is working to determine the facts. Yahoo works hard to keep our users safe, and we always encourage our users to create strong passwords, or give up passwords altogether by using Yahoo Account Key, and use different passwords for different platforms.”

Sunnyvale, California-based Yahoo last week agreed to be acquired by Verizon Communications Inc. for $4.83 billion. Its web services still draw about a billion monthly users overall.

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