The attack may have been carried out by 38-year-old ‘Minah’, an orangutan who has attacked a number of foreign tourists in the Bukit Lawang resort area.

The victim was identified as Binula Wickramarachchi, 27, by Riswan Bangun, manager of the Sumatra Orangutan Observation Centre in Bukit Lawang.

He said the tourist was currently in a satisfactory condition at the Colombia Hospital in Medan.

Details of the encounter are scarce, but it is understood the victim was bitten on his right knee.

Wickramarachchi is originally from Sri Lanka but is currently living in Auckland.