However, AIB chairman Lochlann Quinn said in Dublin that there was 'considerable evidence' of external and internal collusion over the fraud. In the US, Allfirst's chairman Frank Bramble accused Rusnak of carrying out a lengthy fraud. 'At this point this is what appears to have been a very sophisticated and well thought out fraud on this individual's part,' he said. At least four members of the bank's staff are reported to have been suspended, including Matthew Kozak, the vice- president of foreign exchange and the only other trader in the department.