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The U.S. Securities and Exchange Commission is investigating a previously disclosed data breach at Yahoo, the company said in a filing.
Yahoo said in a November 2016 quarterly filing that it was cooperating with federal, state and foreign agencies, including the SEC, that were seeking information and documents about a "security incident and related matters."
The SEC is investigating whether two massive data breaches at Yahoo should have been reported sooner to investors, The Wall Street Journal reported on Sunday, citing people familiar with the matter.
An SEC spokesman declined to comment. A Yahoo spokesman directed Reuters to the company's November filing.
Yahoo has faced pointed questions about exactly when it knew about a 2014 cyber attack it announced in September that exposed the email credentials of half a billion accounts.
In December, Yahoo said it had uncovered yet another massive cyberattack, saying data from more than 1 billion user accounts was compromised in August 2013.
The SEC issued requests for documents in December, as it probes whether the technology companys disclosures about the cyber attacks complied with civil securities laws, the people said, according to the Journal.
Securities industry rules require companies to disclose cyber breaches to investors. Although the SEC has long-standing guidance on when publicly traded companies should report hacking incidents, companies that have experienced known breaches often omit those details in regulatory filings, according to a 2012 Reuters investigation.
Democratic U.S. Senator Mark Warner asked the SEC in September to investigate whether Yahoo and its senior executives fulfilled obligations to inform investors and the public about the 2014 hacking attack.
The disclosures from Yahoo about both breaches came after the company agreed to sell its main business to Verizon Communications in July, triggering questions about whether the deal would still be viable and, if so, at what price.
Other agencies looking into the data breach include the Federal Trade Commission, the U.S. Attorneys Office in Manhattan and a number of State Attorneys General, Yahoo said in the November filing.
(Disclsoure: CNBC has a content sharing arrangement with Yahoo Finance.)