In a meeting between military officers, Baghdad reportedly signaled to Tehran: "All of the Iraqi Army's intelligence — consider it yours."
Former Iraqi Prime Minister Haidar al-Abadi was willing to have ties with Iranian intelligence and detailed a January 2015 meeting with an operative. Abadi denied this taking place in a statement released after the leak was revealed.
The cables, written mainly in 2014-2015, at the height of the war against the Islamic State, show heavy interference by Iran, with Iraq yielding on the issue.
The New York Times and The Intercept said they had verified about 700 pages of reports received from an anonymous source. The source had said they wanted to "let the world know what Iran is doing in my country Iraq."
Vanessa Gezari, National Security Editor at The Intercept, said: "We received these documents, we didn't know who they were from, we still don't know who they're from."
The demonstrations in Iraq have exposed long-held resentment at what citizens feel is neighboring Iran's interference in the running of their country. As a result, Iraqis have targeted Shiite political parties and militias with close relations to Tehran.