Bandits have attacked an Amazon tourist boat and robbed more than two dozen tourists from Australia, New Zealand and the US, Peruvian authorities say.

Oscar Garrido-Lecca, the port captain in the river city of Iquitos, says police are hunting through the area to find the robbers.

He says the attackers used a small craft to reach the Amazon Discovery tour cruise, boarded it and then robbed passengers and crew of goods worth about US$20,000 ($27,800) early on Thursday.

The tourists included six Australians, two from New Zealand and 21 Americans. There were also 25 Peruvians working aboard.

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- AAP