Central intelligence agency
ANALYSIS: Why foreign countries are scrambling to set up bases in Africa
Several African governments are hosting foreign military bases, despite the African Union Peace and Security Council’s concerns.
The Instagram posting was an expansion of the premier US spy agency's effort to recruit a younger generation of officers, agents and analysts, having already been on Twitter and Facebook for years.
That means the attacks were likely conducted by the US Central Intelligence Agency.
Al Jazeera says Edwin Snowden played no part in leaking the documents.