From the BBC:

Australian Defence Minister Brendan Nelson has admitted that securing oil supplies is a key factor behind the presence of Australian troops in Iraq.

He said maintaining "resource security" in the Middle East was a priority.

But PM John Howard has played down the comments, saying it was "stretching it a bit" to conclude that Australia's Iraq involvement was motivated by oil.

The remarks are causing heated debate as the US-led Iraq coalition has avoided linking the war and oil.