The claims add to those included in a civil case that the watchdog filed in August, in which the watchdog accused CBA of several breaches of law including failing to identify, monitor and report money transfers over A$10,000 (5,710 pounds), in contravention of the anti-money laundering and counter-terrorism financing Act.

"These allegations are very serious and reflect systemic non-compliance over approximately six years", Australian Transaction Reports and Analysis Centre (AUSTRAC) Chief Executive Nicole Rose said in a statement.

CBA on Wednesday formally admitted to a range of allegations levelled against it, but disputed the number of contraventions. On Thursday, it said it would file an amended defence in due course.

"We take our anti-money laundering and counter-terrorism financing ... obligations extremely seriously, and deeply regret any failure on our part to comply with these obligations," CBA said in a statement on Thursday.

The amended claims included attempts to wire money to Beirut by a person who was in 2005 convicted of terrorism-related activities which was not reported to Austrac within 24 hours, as required, according to a filing with Australia's Federal Court.

"In spite of concluding on 26 June 2017, that potential terrorism financing was being conducted on CommBank Account 184, a stop was not put on CommBank Account 184 until 9 August 2017," AUSTRAC said in court documents.

CBA on Wednesday said the late filings of many reports were the result of a single systems-related error.

The maximum penalty for a single contravention is up to $21 million.

AUSTRAC is continuing to work with the CBA to help strengthen its anti-money laundering and counter-terrorism financing processes, Rose said.

(Reporting by Melanie Burton; Editing by Christopher Cushing)