The report issued by Carlton Mann, assistant inspector general for inspections, said independent radiation studies concluded radiation levels did not pose a danger.

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"Not only was a large volume (11 out of 47 systems) of OPM's IT systems operating without a valid Authorization, but several of these systems are among the most critical and sensitive applications owned by the agency, " Michael Esser, OPM's assistant inspector general for audits, wrote in testimony prepared for committee.

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The victims comprised of an assistant police sub-inspector and three members of the Frontier Corps, a paramilitary force which uses recruits from Pakistan's tribal areas and is overseen by Pakistani army officers.

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