More than 200 people, including 88 Australians, were killed in Bali when three separate bombs were detonated in the town of Kuta late on October 12. A further 200 people were injured.
Eleven months later, 12 people died and 150 were wounded when a car bomb was detonated outside the JW Marriott Hotel lobby.
And on September 9 2004, a car bomb exploded four metres from the front gates of the Australian Embassy in Jakarta.
Eleven people were killed, including passers-by, an Embassy guard and gardener. More than 160 people were injured.
The attacks in Jakarta were led by Noordin Mohammed Top and Dr Azahari Husin, two Malaysian-born terrorists aligned with the extremist Muslim network, Jemaah Islamiah.
Azahari, dubbed the "demolition man", was killed in a police raid in November 2005. He reportedly blew himself and two colleagues up rather than be taken alive.
The Department of Foreign Affairs noted in its official comment on today's attacks that Noordin remained at large.
Jemaah Islamiah began as a separatist movement in Indonesia but evolved in an extremist organisation with links to Al Qaeda.
Three men convicted of orchestrating the Bali bombings, Amrozi, Imam Samudra and Mukhlas, were executed by firing squad in November last year.