ISIS has enormous financial reserves. When Iraqi forced killed the ISIS commander of Mosul in June 2014, they retrieved 160 computer flash drives – which the CIA, among others, has been combing for information. According to The Guardian newspaper, the drives contained "noms de guerre of all foreign fighters, senior leaders and their code words, initials of sources inside ministries and full accounts of the group's finances." A British official told the newspaper, "Before Mosul, their total cash and assets were $875 million. Afterwards, with the money they robbed from banks and the value of the military supplies they looted, they could add another $1.5 billion to that." ISIS, then, was not unknown to American, British, Iraqi or other intelligence services before it began its streak across the Syrian-Iraqi border and the acquisition of territory in which it has declared its caliphate.