The exchange's website has been taken down, and currently displays the following message
:Dear MtGox Customers,While the $375 million figure is, of course, malleable due to the ups-and-downs of BTC value, 750,000 BTC -- or to be precise, 744,408 BTC is about 6 percent of all the bitcoins in circulation.
In light of recent news reports and the potential repercussions on MtGox's operations and the market, a decision was taken to close all transactions for the time being in order to protect the site and our users. We will be closely monitoring the situation and will react accordingly.
Though it is unclear what will happen to customers of Mt. Gox, a number of other bitcoin community members said, in a statement, that they would work together to reassure customers and the general public. These include Coinbase, Kraken, BitStamp, Circle, and BTC China.
As nascent a currency as it is, bitcoin investing holds substantial risk. The revelations about Mt. Gox only go to further show just how risky it really is.