(Bloomberg) -- Yahoo! Inc.’s accounts were hacked in 2014 by cybercriminals rather than a state-sponsored party as the web portal claimed, according to an official with InfoArmor, a security company.

Hackers-for-hire using pseudonyms who are well known in the underground community broke into Yahoo’s data, said Andrew Komarov, chief intelligence officer with InfoArmor. Yahoo said last week the attacker was a “state-sponsored actor,” and the stolen information from at least 500 million users may have included names, e-mail addresses, phone numbers, and, in some cases, un-encrypted security questions and answers.

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