AUSTRAC says five customers appear to have used Commonwealth Bank's (CBA) intelligent deposit ATMs to make transactions that financed terrorism.

The financial intelligence agency's acting chief executive Peter Clark told a senate committee that investigators looked at three other Australian banks - Westpac, the ANZ, and National Australia Bank - for the same activity detected at CBA, but they were declared "all clear".  However, five customers at CBA didn't look good:

"Of the late threshold transaction reports we've claimed that six of those relate to cash transactions by five customers whom the bank has accessed as (having) a potential link to terrorism or terrorism financing," Mr Clark said.

Earlier this month, AUSTRAC alleged CBA had failed to report 53,506 transactions, and that criminal syndicates were using the CBA intelligent deposit machines to launder month through the bank, which had failed to monitor the suspicious transactions.

Commonwealth Bank concedes that "mistakes were made", but insists there was no intention to financially benefit from alleged transactions by drug runners, terrorist financiers, and other criminal elements.