Police arrested five college students in connection with the killing of a student of Chittagong Collegiate School in the city's Jamal Khan area on Thursday.
Among them, four 2nd year students of Hazera Taju Degree college - Sabbir, Fahim, Aabu Sayed and Arman --were arrested from Fatikchhari upazila of the district while Muntasir from the port city's Badurtola area.
A blood-stained knife which was used in the killing was also recovered, said officer-in-charge of Kotwali Police Station Md Jasim Uddin.
On January 16, Adnan Isfar, 15, a class-IX student of Chittagong Collegiate School and College, was stabbed to death by some youths in the city following dispute over a cricket match.
At one stage of an argument, Isfar's friends stabbed him, said the OC adding that the boy started running after being chased and collapsed at Jamal khan.
Being rescued, he was taken to Chittagong Medical College Hospital where doctors declared him dead.
The OC said they collected a video footage which showed the schoolboy was running in an injured condition while some others were chasing him.
Following the incident, a case was filed with the police station.