Any idea how come?
And what exactly is it about you with them? Bitstamp is one exchange that have proven to be legit and I believe they have explanation for this with the experts that would be advising them. If they are not on the right side of law, while they can get away with it in other third world countries, they surely can do that in the United States and they won't even need you to remind them the amount trouble they are in.
If you don't trust them enough to handle your funds just decide and move it out immediately pending when the 'authority' will be ready for them and seize all of their funds.