Police are preparing to make five more arrests after a suspect in the Sunday gunfight that killed an Indian tourist and injured four other people in the Pratunam area turned himself in on Tuesday.

The hunt for the gunmen is being pursued with all available resources after the shootout between two gangs saw groups of tourists caught in the crossfire.

The shooting of the Indian, and injuries to a compatriot, a Lao national and two Thais, near the Watergate Pavilion shopping mall on the night of Oct 7, have led to police holding daily briefings.

Acting deputy city police chief Khatcha Thatsat announced the progress so far.

"We've detained one suspect named Preecha Sakudomphaisan," Khatcha told reporters, adding that there are "many" suspects on their wanted list.

Police will ask the court to issue warrants for the arrest of five more people, he said.

The officers are checking footage from four security cameras at the crime scene to gather more information about what happened.

Mr Preecha surrendered to Phaya Thai police the day after the deadly shooting and "confessed", Khatcha said.

However, Khatcha did not say Tuesday whether the 28-year-old had fired the AK-47 assault rifle used in the gunfight The police are investigating how the firearm was obtained by the gang.

Reportedly, Mr Preecha will be charged with premeditated murder as he was central to what happened.

The man reportedly oversaw a snooker hall in the area and his quarrel with a rival gang led to the gunfight.

Mr Preecha had allegedly been threatened by the aides of Bamphen Phumphuang, 23, who did not believe Mr Preecha was looking after the snooker hall.

"That is believed to have led to the brawl and deadly gunfight," Pol Maj Gen Katcha said.

Their fight erupted in a car park near the shopping mall where foreign tourists were waiting to board a coach.

As they fired at each other, some bullets hit the five victims.