Two teenagers were found guilty of rioting on Friday, following an attack that left a student with stab wounds to his back.
Lim Ming Yi and Liong Hong Ting, now 18, were part of a group of five teenagers arrested last December for stabbing 17-year-old Raffles Institution student Anand Ravindran, an Indonesian, with a knife.
Sentencing has been fixed for next month pending probation and reformative training centre reports, which the judge called for. The two remain in remand.
The incident, which took place at a void deck in Potong Pasir Avenue 1, also left another student, 17-year-old Don Tan Wen Bin, with a bruised right eye. He is a former schoolmate of Anand.
Lim and Liong are not the first to be convicted over the fracas.
In April, Isaac Ang Shi Ming, 17, was given two years' probation for rioting as well.
This leaves two others who are yet to be dealt with, including a 15-year-old boy who cannot be named due to his age.
Another suspect, Terence Chue Wei Teck, 17, will have his case mentioned again on June 26.
The court had earlier heard that the 15-year-old was the one who stabbed Anand twice in the back, after Lim accused Don of staring at him.
Two girls were also at the scene.
Anand managed to run to a clinic for help, and was treated at Tan Tock Seng Hospital.
Those found guilty of rioting armed with a deadly weapon can be jailed for up to 10 years and caned.