Aussie foreign fighter numbers falling

The number of Australians fighting or working with terrorist groups in Syria and Iraq is falling.

Attorney-General George Brandis says about100 are in the conflict zones, down from 110 in October 2015 and previously as high as 120.

"This is a continuing downward trend which is based on several factors, the most significant of which is the number of Australians being killed in the region," Senator Brandis said on Thursday.