The police are applying for arrest warrants for two men aged 30 and 19 for the Monday shooting of rival gang in Soi Lasalle 19 in Bangkok's Bang Na district.
Officers said the suspects were identified as the long-haired Prasertsak Singsopa, 30, who was shown on CCTV as the shooter, and Peerapol Poungburi, 19.
Their accomplice, Jaturong Eiumtuam, 30, turned himself in on Tuesday night.
The shooting at around 5pm on Monday started when Peerapol, accompanied by a 15-year-old male, collided on his motorcycle with a gang of 12 rivals with four motorcycles.
The two teens were chased and cornered by the rival group who was about to attack them with knives. Peerapol pulled out a gun and shot at the rival group, who hid in a nearby apartment.
Jaturong rode the motorcycle for Prasertsak to shoot at apartment, breaking windows, slightly injuring several gang rivals and an apartment maid.
The maid, Pathum Sriprasert, 39, who sustained minor cuts from a broken window, said five youths, three of whom were carrying knives, ran into the building.
"I was in shock," she said.