City leaders say the invoices are purposefully vague. "Because of some of the particulars involved and some of the locations, some of the number of individuals involved in these things, we don't want to put anyone at risk," Miller tells us. "And so, some of these invoices contain what we believe to be the appropriate level of information. And we verified it through our meetings with them, through the discussions that we've had in the threat analysis and through receiving... sort of the risk information that they provided to us. "