A 92-year-old man was attacked by a wild boar on a rural island in Sai Kung in the New Territories on Thursday.

The old villager surnamed Wong found the boar in Sheung Wai village on Grass Island, or Tap Mun, at 2am, Headline Daily reported.

The man tried to drive the animal away but it attacked him, biting his right arm and leg before running off.

Police searched the area but could not find the wild pig.

Wong was later sent to Wong Shek Pier and transferred to hospital for medical treatment. He is in a stable condition.

The incident was the fourth case of a wild pig attacking and biting a person over the past eight years.

Wild pigs are the largest native terrestrial mammal and widespread in the city. An adult pig could weigh up to 200 kilograms and reach a body length up to two meters, according to information on the Agriculture, Fisheries and Conservation Department website.

In general, wild pigs are secretive and wary of human contact. However, if provoked or threatened they can become aggressive and attack people, particularly dominant males or sows with piglets.

People are advised to stay away and leave the pigs undisturbed when they see one. People should not try to drive them away with an object.