In an upgraded travel advisory, the Department of Foreign Affairs and Trade said terrorists were actively planning attacks which could take place at any time.

The advisory says Australians should reconsider their need to travel to Indonesia.

"There have been recent arrests of high-level terrorist operatives in Indonesia, but we assess terrorists are continuing active planning of attacks,'' it says.

"These attacks could take place at any time and could be imminent.

"Particular care should be taken at this time to avoid known terrorist targets.''

These included Bali and the capital Jakarta.

"Ask yourself whether, given your own personal circumstances, you're comfortable travelling to Indonesia including Bali, knowing that there is a very high threat from terrorism and you may be caught up in a terrorist attack,'' the advisory says.

"Ask yourself whether travel could be deferred or an alternative destination chosen.''

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