Tokyo-based Bitcoin exchange Mt. Gox lost $400 million worth of bitcoins in February. Its management said the amount was stolen after hackers exploited a transaction bug to divert the funds, but some of Mt. Goxs users are not so sure, suggesting instead that the exchanges owners pocketed the cash. Forbes reports that the group gained access to the personal blog and Reddit account of Mark Karpeles, Mt. Goxs CEO. The hackers claim that Mt. Gox still has access to 951,116 bitcoins