Hayley Tsukayama Craig Timberg Brian Fung The Washington Post

Yahoo on Thursday reported the largest data breach in history - affecting at least 500 million user accounts - months after first detecting signs of an intrusion that the company blamed on "state-sponsored" hackers.

Yahoo on Thursday reported the largest data breach in history - affecting at least 500 million user accounts - months after first detecting signs of an intrusion that the company blamed on "state-sponsored" hackers.