BNP Paribas, a big France bank, owns 198 billion Euro's worth of Greek bonds. Which will become officially worthless real soon now. The same bank says that it has increased its capital reserves to 57 billion Euros.
So when ever BNP Paribas faces reality, they will find themselves underwater by 141 billion Euro's. Reality being that the 198 billion Euros worth of Greek bonds are really worthless.
They aren't the only European bank stupid enough to buy Greek bonds.