The infamous "ongoing investigation". Translation, we don't want to disclose how we broke the rules.
Or, as the Transportation Commissioner for Philadelphia said after a passenger train careened off the rails:
“We have a preliminary indication;
But it’s under investigation;
So we won’t comment on the situation
Until we have further information.
He was a natural rapper, that guy. Maybe he didn’t know it; maybe he did. Anyway, it has since become my go-to parody of bureaucrats’ inaction :)