CCI is investigating the European correspondent banks of Mt. Gox's bank in Japan, Mizuho. At least the European ones, according to CCI, followed a pattern of distorting information about Mt. Gox's money transfers from Europe back and forth with their Japanese bank. It's not too much of a stretch of imagination to believe that these cooperating banks worked together with Mizuho to slow down deposits to the exchange, and speed up withdrawals in order to cause an artificial cash squeeze with Mt. Gox. This would cause them to become illiquid and unable to make payments on their line of credit with the bank.