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S&P500
2397.57
+33.93
+1.44%
NASDAQ
5902.31
+76.87
+1.32%
NYSE
11651.978
+139.588
+1.2125%
GOOG
834.66
+11.45
+1.39%
YHOO
46.24
+0.58
+1.27%
AAPL
139.965
+2.975
+2.172%
AMZN
852.81
+7.77
+0.92%
FB
136.495
+0.955
+0.705%
BPOP
44.915
+0.855
+1.941%
EVTC
17.45
+0.6
+3.56%
OFG
13.35
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FBP
6.525
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GTS
19.02
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Yahoo took its time investigating massive security breach

By on November 10, 2016

In this June 5, 2014, file photo, people walk in front of a Yahoo sign at the company's headquarters in Sunnyvale, Calif. (AP Photo/Marcio Jose Sanchez, File)

In this June 5, 2014, file photo, people walk in front of a Yahoo sign at the company’s headquarters in Sunnyvale, Calif. (AP Photo/Marcio Jose Sanchez, File)

SAN FRANCISCO – Yahoo detected evidence that a hacker had broken into its computer network at least 18 months before launching an investigation that discovered personal information had been stolen from about 500 million user accounts.

The timeline outlined in a regulatory filing raises further questions about why it took Yahoo so long to realize the severity of its security breakdown. It also could provide Verizon Communications with reason to revise or terminate its $4.8 billion deal to buy Yahoo’s online services.

Yahoo disclosed the size of the breach seven weeks ago. At that time, Yahoo traced its findings to an inquiry opened in late July.

But Yahoo’s regulatory filing late Wednesday acknowledged the company first became aware of the hack in late 2014. It is now investigating how much was known then.

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