The letter was opened by his personal assistant and contained white bacterial powder and a threatening message.
The act is suspected to be related to the Schapelle Corby trial held at the time in Bali, Indonesia.
[2] Other Indonesian Diplomatic missions around Australia have reported receiving threatening emails and letters since the trial began.
On 3 June 2005, a section of Parliament House was sealed off when the discovery of a suspicious package delivered to Foreign Minister Alexander Downer was discovered in the car park.
The analysis has since shown the contents to be harmless but forensic tests are continuing to establish if there are any links between this package and the earlier one sent to the Indonesian embassy.