They have three heads that they're examining and that's a typical outcome from a suicide bomber, but that's not yet confirmed and that will require further analysis as the evening progresses.

To identify the type of explosive that's been used and to try and quickly identify particularly whether they're suicide vests, the origin of those vests, the type of material that's been used in the bomb to try and determine the origins of that and how widely available that is.

So in that sense it's not exactly the same as the bombing of the nightclubs in Bali on the October evening back in 2002.

I think the issue about the proposed bill was an issue of transparency.

The Indonesian national police forensic team has quickly been able to determine the number of bombs involved. What we're working with them on now is the actual make-up of the bomb. They're quite a different bomb to the ones we've seen been used before.

But how well organized they are, what their capacity is to actually mount any operation remains to be seen.

This is not something that we can do as Australian Federal Police by ourselves.

Obviously we're very concerned that other explosives are inside the house, so all that forensic work will be done over the next day or two.

It's important that we give these people a fair opportunity to prepare their defense before the court rather than run their trial in the media.