The leader of the Islamic State group, Abu Bakr al-Baghdadi delivering a speech an ISIS overrun mosque in what would be a rare - if not the first - public appearance by the shadowy militant.

INTERVIEW: Who Is ISIS Leader Abu Bakr al-Baghdadi?

This person was one of us. He was raised and fed among us,” says an intrepid journalist whose recent documentary on the leader of ISIS reveals an intelligent man who grew up outside of Baghdad, playing football and leading prayers at the local mosque.