The Department of Foreign Affairs and Trade (DFAT) updated its advice yesterday warning the Australians travelling to India that militants could be planning another terror attack against upmarket hotels in India's largest city.

"We continue to advise Australians to exercise a high degree of caution in India overall because of the high threat of terrorist activities, civil unrest and crime and the high rate of vehicle accidents," DFAT said.

"We continue to receive reports that terrorists are planning attacks in India and assess that attacks could occur anywhere at any time with little or no warning, including in locations frequented by Australians," it said.

"This advice contains new information in the Summary and under Entry and exit (India will no longer issue medical visas to Australians planning to commission surrogacy who reside in Australian states/territories where overseas commercial surrogacy is illegal) and Safety and security (information of mid-December 2014 indicates that militants may be planning attacks against upmarket hotels in Mumbai," it said adding however, the information was still under investigation).

DFAT in its update, also advised those travelling to Indonesia, urging Australians to "exercise a high degree of caution in Indonesia, including Bali".

It said the alert level had not changed, but had been updated to include a high threat of terrorist attack.

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