Tai Kok Tsui in Kowloon, where a Vietnamese man was attacked last Friday morning. Police are hunting five attackers also believed to be from Vietnam. Photo: Google Maps

A 27-year-old Vietnamese man was attacked by five compatriots in Tai Kok Tsui in Kowloon on Friday.

The man, who is an illegal immigrant, was in Lok Kwan Street Park in Tai Kok Tsui at 8am when five Vietnamese approached him. After a short conversation in Vietnamese, they began kicking and punching him, Oriental Daily reported.

The five men then stabbed him with knives and cut off the little finger on his left hand.

The injured man ran off with the five countrymen chasing him down the street before passersby called the police.

When police arrived, the gang had already left.

The Vietnamese man was sent to hospital for medical treatment after police officers searched for his missing finger on the street.

Police later discovered that the injured man was an illegal immigrant and arrested him. He had been to mainland China before coming to Hong Kong – sneaking in on a train, as he planned to work illegally to earn money.

The crime unit from Mong Kok police is investigating the case. They have not ruled out the possibility that a triad with a Southeast Asian background may be involved.