Indonesia's Health Ministry has confirmed that two Australians were killed in the Jakarta hotel bombings on Friday.

The Ministry says Nathan Verity and Garth McEvoy both died in the blasts.

The wife and father of Perth businessman Mr Verity will identify his body today before bringing him home for burial.

Indonesian police say two suicide bombers were behind the blasts at the Ritz-Carlton and the Marriott hotels, in which nine people are confirmed to have died and a further 42 injured.

Indonesia's anti-terrorism chief Ansyaad Mbai says the bombings are "clearly linked" to the Malaysian-born extremist Noordin Mohammed Top because of the homemade characteristics of the explosives used.

Grave fears remain for Austrade mining commissioner Craig Senger, who is believed to have been very close to the epicentre of the blast at the JW Marriott hotel.

The family of Mr Senger have spoken of their devastation as they await official confirmation he was among those killed.

The Austrade official, 36, from Canberra, is believed to have died in the bombing.

"Yesterday we were in shock but today we are devastated," Mr Senger's uncle, Geoff Lazarus said.

"We're still waiting for the official confirmation. Things have taken a little longer than we expected."

Mr Senger's wife spent most of Friday at the Australian Embassy in Jakarta awaiting news.

She was told by officials that Mr Senger was missing, presumed dead.

Mr Lazarus says the family will make no further comment to the media until then but would issue a statement once confirmation was received.

'Distraught and upset'

Jim Truscott, a personal friend of Mr Verity's, says the pair are due to land in Jakarta today and says the family is clearly very distraught.

"Once that is done it will enable them to bring him back to Perth for a funeral," Mr Truscott said.

"Clearly they are very distraught and upset.

"We have a grandmother looking after their five-year-old son."

Mr Verity, 38, ran a human resources and recruitment business out of Jakarta

Australian mining company executive Garth McEvoy and New Zealand executive Tim Mackay are also believed to be among the nine people killed in the blasts.

Meanwhile Prime Minister Kevin Rudd has flown to Canberra for a special meeting of the National Security Committee, in the wake of the bombings.

The meeting will also include the Defence Minister, the heads of the Australian Security Intelligence Organisation and other Government departments.

Foreign Affairs Minister Stephen Smith is leading a delegation of experts to Jakarta to provide support to Indonesia.

DFAT has updated a travel warning for Indonesia, urging Australians to "avoid travel to affected areas".

DFAT says it is still receiving advice that terrorists could be planning more attacks in Indonesia, particularly Bali.

The Department says Australians in Jakarta who need consular assistance should call DFAT on +61 2 6261 3305.

DFAT says Australians who are worried about family or friends in Jakarta should first try to contact them directly.

A spokeswoman says if that is not successful, concerned relatives should call DFAT's Consular Emergency Centre on 1300 555 135.