The two youths, whose names are withheld and are aged 15 and 16, were apprehended in front of a house in Tha Thongmai in Kanchanadit district of Surat Thani province this morning.
Police, armed with search and arrest warrants, were searching the house for weapons and other evidence when the pair arrived on a motorcycle.
The arrest followed an investigation into whether the two youths had been involved in the fatal shooting of three teenagers on the night of July 3.
Surachart Torlee, 18, Veerayuth Torbai, 16 and Theerapong Tormad, 16, were shot in the chest. They were hit by bullets fired from shotguns.
Maj Gen Apichart Boonsriroj, chief of Surat Thani police, said police found that the two teenagers were involved in the shooting.
During interrogation, the suspects confessed their group had engaged in a brawl with their rival gang. They claimed the victims’ gang had started the attack and denied shooting dead the three teens, said Maj Gen Apichart.
Police say they have obtained sufficient evidence to substantiate the charges against them.
The suspects were held in police custody for legal action.
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