News of the development is based, according to South Korea's Yonhap news agency, on a National Intelligence Service assessment shared with South Korean lawmakers. BBC noted difficulty verifying NIIS information.
Jang had been considered No. 2 in the Pyongyang government and was a mentor to his nephew. His dismissal follows the execution of his two deputies for "corruption and anti-party activities."
A North Korea scholar shared his insight into the power shake-up with CBSNews.com. "The signs have been there for some time that Jang was fading. He has been appearing less and less frequently in Kim Jong Un's presence, or indeed, at all. If that change in his previously high-profile visibility was not caused by health problems, it suggested a political problem."
[New York Times]