Three underage boys of Tinghmun in northeastern Mizoram were today held for murder that shocked the Mizoram-Manipur border this morning. The dead body of Lalmanchhunga, 15, was found lying on the main road of the village with injuries on the back of his neck and head. "The injuries suggested that Lalmanchhunga had been hit with heavy object," Aizawl SP Lalbiakthanga Khiangte said here today. The deceased was seen engaging in a heated argument with the three other boys on Saturday night. However, they were also found watching together a television at someone's house after the their argument as though nothing had occurred. "As the accused were minors, the case would be taken up by the juvenile justice board," the police official said.