Indonesian police say there is no indication that a terror attack was the cause of a tourist boat explosion in Bali that killed two people.

Karangasem district police chief Sugeng Sudarso said Friday that investigators believe a fuel leak below deck caused a buildup of fumes that ignited, though the finding is provisional.

Sudarso said there was no indication of terrorism and the bomb squad did not find any explosive materials.

Bali police have given conflicting accounts of the nationalities of the two women killed in Thursday's explosion but now say one was from Austria and the other from Spain.

Sanglah Hospital gave the same information for the nationalities and said the Austrian woman was 28.