Mt. Gox was hacked and its user database exposed earlier today, as we all have become grimly aware of, but the plot slowly thickens as evidence mounts in contradiction to their official story. If they revise their official statement, you can view a webarchive version here.
Update: Mt. Gox is in fact responsible for the 432,000 BTC transfer, this was them securing all remaining Mt. Gox Bitcoin assets to a secured location.
Mt. Gox claimed that only one user account had been compromised, and ill-begotten funds hadn't surmounted a USD value of $1,000 due to their website's trade sanctions. HOWEVER, live market analysis by BitcoinChannel shows hundreds to thousands of microtransactions being made as the exchange value at Mt. Gox plummeted earlier today.