Looking at http://bitcoin.clarkmoody.com/widget/chart/ it appears (based on the red volume spikes) another huge sell off and Mt. Gox pulls the plug twice in a row. I believe they do not want to see BTC under $100 and think they can control it.
I was thinking about that too, DDOS never killed them before just made them slower. Today they're pulling out as soon as price is failing.
You suggest pulling out?
This does not look normal - does it? I am definitely not a financial genius.