The Japanese bank has filed crossclaims against Mark Karpeles at the California Central District Court.

Less than a week after former customers of ill-fated Bitcoin exchange Mt. Gox managed to convince the Court that their claims about Mizuho Bank’s fraudulent concealment of information related to Mt. Gox’s client funds transactions are plausible, the Japanese bank has decided to put the blame for the damages on Mark Karpeles.

Earlier this week, Mizuho Bank filed crossclaims against the former President, CEO, and majority shareholder of Mt. Gox. The new claims are part of a case targeting Mizuho and Karpeles. The plaintiff – Joseph Lack, a former customer of the Exchange, alleges that Mizuho did not inform customers of MtGox about the transaction difficulties they might experience and thus created a trap, where they could put the money into MtGox’s account but could not withdraw anything.

Now, the Exchange seeks to put the blame on Karpeles. The crossclaims filed with the California Central District Court earlier this week seek to hold Karpeles accountable for the damages caused.

Mizuho alleges that Karpeles was aware that there were security “bugs” in the Mt. Gox system as early as 2011, and that he stole Mt. Gox users’ bitcoins, either by exploiting the security “bugs” or otherwise. Karpeles is said to have made numerous representations to the public and to Mt. Gox users that the withdrawal issues were only temporary and that user assets were safe. Karpeles also assured users through the Mt. Gox online Support Desk that any problems were being dealt with and that there was no cause for alarm.

According to Mizuho, if it had not been for Karpeles’s fraud, Mizuho would not have been sued by MtGox’s customers over the transactions issues, and would not have incurred any losses relating to this action. Karpeles is the actual and proximate cause of any damages suffered by Lack, the bank says.

Mizuho said Karpeles owed it a duty of reasonable care to avoid violating the bank’s rights or legally protected interests. Karpeles’ statements were, at a minimum, negligent and done without reasonable care for the truth or the consequences of these statements, according to the bank.

Mizuho argues that its damages were proximately caused by Karpeles’s false statements.

Mizuho denies all liability alleged against it by Joseph Lack. However, pursuant to Japanese law and/or other applicable law, in the event Mizuho is found liable in any respect, Mizuho is entitled to recover from Karpeles the proportion of the plaintiff’s alleged damages, the bank argues.

The case is captioned Joseph Lack v. Mizuho Bank, Ltd., et al (2:18-cv-00617).