A very sad day for all those involved. I would imagine that the Balinese will be in deep shock. They are one of the friendliest people I have ever come across. Although Indonesia is the most populous Muslim country in the world, Bali is about 85% Hindu. They probably never imagined anything like this happening on their island.
The UK Government is advising people not to travel to Bali and Qantas is sending a fleet of aircraft to evacuate Australians.
Nothing should be spared in finding and brining to justice the cowards that carried out this attack.