Originally founded in the 16th Century by the Portuguese, work commenced inearnest on the fort in 1663 under Dutch colonial rule, when it became the country's primary port.
The requesting Inspectors General are tasked with overseeing investigations that can take multiple years to complete, and the oversight work often begins inearnest during the final phases of a project.
Construction on the facility - believed by the US to be large enough to contain 3, 000 centrifuges, not large enough for commercial work - started inearnestin mid-2006, diplomatic sources said.