A ten-year-old madrassah student was hacked to death allegedly by his roommate at Makhfunul Ulum Madrassah in Sonaimuri upazila of Noakhali district on early Monday.
The deceased was identified as Nazim Uddin, son of Obayed Ullah of village Jahanabad.
Khorshid Alam, officer-in-charge of Sonaimuri Police Station, said that Nazim had an altercation with his roommate Abu Sayed, 16, son of Rustam Ali of Mymensingh district over wearing a cap.
Sayed killed Nazim by slitting his throat with a sharp weapon while he was asleep at about 2:30am, he said.
Other students of the madrassah and a teacher noticed the matter and informed police who arrested Sayed.
During primary interrogation, Sayed confessed to his guilt, said police.
The body was sent to the 250-bed Noakhali General Hospital.