By Phil Mercer BBC correspondent in Sydney

Police said this vehicle carried the bomb

At least nine people were killed and dozens more injured in Thursday's suspected suicide attack.

Australian Prime Minister John Howard also announced an upgrade of security at the country's diplomatic missions.

The moves came as the government's National Security Committee met in Sydney to discuss its response.

Senior ministers were briefed by the chief of the defence force, General Peter Cosgrove and the federal police commissioner, Mick Keelty, who has recently returned from the Indonesian capital.

The foreign minister, Alexander Downer, said Australia should do more to help Indonesian police.

Election campaign

The government has promised around US$3.5m to bolster the investigation. Security at other Australian missions overseas will also be upgraded.

Mr Howard said the bomb-proofing of the embassy in Jakarta, which he believed had saved many lives, would be used as a model for other diplomatic facilities around the world.

Thursday's bombing came in the middle of a general election campaign in Australia. It has thrust national security to the top of the agenda.

Analysts have said that Mr Howard could be punished by voters who fear Australia's involvement in Iraq has made the country a bigger target for extremists.