The deceased was identified as Soad Hossain, 14, son of Malaysia expatriate Dulal Hossain of Bholadanga village and a seventh-grade student at a local high school.
The injured are Sagar Hossain, 15, son of Monirul Islam, and Bahadur Ali, 20, son of Abbas Ali, both from the same village.
Schoolboy killed in Moulvibazar bike crash
The accident took place around 6:30pm on the Gangni-Hatboalia road at Gojaria Hemayetpur when the motorcycle carrying the trio, driven by Soad, lost control and collided with another bike before hitting a roadside sawmill.
All three sustained severe injuries, and locals rushed them to a nearby hospital where doctors declared Soad dead, said Gangni Police Station officer-in-charge Bani Israil, reports UNB.