REUTERS

The 32-page Urdu-language document obtained by American Media Institute (AMI) and reviewed by USA TODAY details a plot to attack U.S. soldiers as they withdraw from Afghanistan and target American diplomats and Pakistani officials.

AMI obtained the document from a Pakistani citizen with connections inside the Pakistani Taliban and had it independently translated from Urdu by Harvard researcher and translator Mustafa Samdani. The Pakistani's identity was shared with USA TODAY, which has agreed not to identify him publicly because of concerns for his safety.

The document was reviewed by three U.S. intelligence officials, who said they believe the document is authentic based on its unique markings and the fact that language used to describe leaders, the writing style and religious wording match other documents from the Islamic State, also known as ISIL, or ISIS. They asked to remain anonymous because they are not authorized to discuss the matter publicly.

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The undated document, titled "A Brief History of the Islamic State Caliphate (ISC), The Caliphate According to the Prophet," seeks to unite dozens of factions of the Pakistani and Afghan Taliban into a single army of terror. It includes a never-before-seen history of the Islamic State, details chilling future battle plans, urges al-Qaeda to join the group and says the Islamic State's leader should be recognized as the sole ruler of the world's 1 billion Muslims under a religious empire called a "caliphate."

The document warns that "preparations" for an attack in India are underway and predicts that an attack will provoke an apocalyptic confrontation with America: "Even if the U.S. tries to attack with all its allies, which undoubtedly it will, the ummah will be united, resulting in the final battle." The word "ummah" refers to the entire global community of Muslims.

As UNIAN reported earlier, ISIS chief Abu Bakr al-Baghdadi issued a decree, prohibiting IS militants from recording executions, as well as from posting them on the Internet.