Executives of the Australia and New Zealand Bank admitted they were “completely shocked” when they learned about trafficking network operations done by former employees from their Melbourne offices.

An investigation by the Australian Federal Police is currently ongoing for the alleged narcotics syndicate in the bank's debt collection department.

Fourteen staffs were linked to the alleged drug syndicate.

ANZ said the unnamed employees used to work in the bank's former city offices in Collins Street.

The said offices, which were used for drug dealings, were later moved to Dorcas Street in South Melbourne.

Stephen Ries, the bank's spokesperson, said the people linked to the investigation were former employees. He did not elaborate further as to why they left or were fired.

"We have been completely shocked by this matter and everyone at ANZ is incredibly disappointed at the matters the police are looking into,’’ he said.

He said that ANZ does not tolerate these kind of actions and assured the employees are no longer working for the bank.

Mr. Ries also confirmed the bank is fully cooperating with the police, however, their actions and words are now limited since all evidences have been handed to the investigators.

Mr. Ries did not comment on claims that the bank's internal email system was utilized as a communication link to drug syndicates.

It was believed that search warrants were issued on ANZ offices while homes of staff members connected to the crime were seized, including its computer records.

An Australian Federal Police spokeswoman told a local media over the phone that 30-year-old man was arrested for allegedly importing a 4-MMC drug, known as “meow meow”. However, it has not been confirmed whether the arrested man was linked to the ANZ Bank.