Responding to questions on the issue at a press briefing, the Director-General Inter-Services Public Relations Major General Asif Ghafoor shared new details on the controversy.
He said Durrani did not obtain a No Objection Certificate from the Pakistan Army for the book he co-authored with Dulat.
The release of the book has sparked accusations of treachery against the former spy chief after his candid views on various matters of regional and global concern came under intense public scrutiny.
The powerful military, which has ruled Pakistan for about half its history since independence in 1947, is considered a major player in the country's politics.
Ghafoor said that the institution itself took notice of the book controversy, and confirmed that an inquiry has been initiated against Durrani.
"An enquiry has been ordered as he (Durrani) failed to give proper explanation when summoned. The probe will complete its work which will be shared," he said.
He said the reaction against Durrani was strong because the Pakistan Army cannot afford to tolerate indiscipline from anyone.
"Pakistan Army has never forgiven any mistake, whether made by a soldier or a general," he said.
Ghafoor also recalled Durrani's dismissal from service, saying that who he was as a person was not the
Army's concern, but who he had been as part of the institution necessitated a review of his actions.
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