Two suspects, including an Indonesian park ranger, have been arrested for illegally trading tiger skins in central Sumatra.

The Jambi Natural Resources Conservation Agency said the pair were apprehended as they were about to sell a tiger skin in Berbak National Park, Jambi province.

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Both could face up to five years in prison and nearly $10,000 in fines.

Police said the investigation had been going since November last year, local media reported.

It is estimated there are fewer than 400 critically endangered Sumatran tigers left in the wild.

The World Wildlife Fund (WWF) said there was still a substantial market in Asia for tiger parts and products.

-ABC