This is the shocking moment a group of Australian tourists fought with British revellers in the sleazy coastal town of Pattaya.

Aussie holidaymaker Zachary Kalen Hallam reportedly chugged beer with his friends at a bar in the notorious Thai 'Sin City' on May 5.

However, he was said to have sparked alarm when he suddenly started shouting at other tourists in an alcohol-induced rampage.

Footage shows the Aussie bellowing as he stormed out of a bar during closing time. He threw a knockout punch at one of the tourists, who fell over with a single blow. Hallam and a still-unidentified suspect then turned their fury on the other bargoers as a woman screamed, trying to control them.

Police said they were notified at 3:45 am local time that three foreigners were injured. They were identified by officers as Brit tourist Jamie Lee Rocca, 33, German holidaymaker Dominik Leupold, and Swedish national Sture Mattias Arnkvist.

The wounded were taken to a hospital for treatment and to obtain a medical certificate for the police investigation. They were later summoned to the police station with their friend, a Cambodian woman named Py Pech.

Police said they obtained CCTV footage from the area, allowing them to identify Hallam, who was arrested and detained at the Pattaya City Police Station. They said they were coordinating with the Immigration Bureau to investigate him for possible visa revocation.

A motorcycle taxi rider who witnessed the altercation said: 'At the time of the incident, we saw two groups of foreigners in a heated argument that quickly escalated into a violent fight in the middle of the street. One person was beaten so badly they collapsed, and then the attackers fled before the police arrived.'

Police Lieutenant Colonel Suthiraphan Tapsri of Pattaya City Police Station said: ‘It was a fight where everyone was drunk. The pub was closed, but the foreigners were standing around arguing about various things.

‘They did not know each other, and it was the first time they had met. The Australian arrived with another suspect who has not yet been arrested, while the four victims came together.

‘We are still investigating to track down the other suspect. It will take some time.'

Former fishing village Pattaya became popular with American troops on 'rest and relaxation' breaks in the 1950s and 1960s when the U.S. military had bases in Thailand while fighting Communism in Vietnam. Rural families are said to have even dressed their sons as women to cash in on the gold rush.

The handful of bars in the coastal town quickly grew and it is now the world's biggest sex holiday destination, with round-the-clock prostitution and drugs - a modern-day Sodom and Gomorrah rife with crime and debauchery.

Government chiefs have attempted to clean up the city but regular violence, depravity and claims of corruption continue to blight its reputation.