Dhaka, Sept. 20 -- Prime suspect Saiful Islam Tuhin was the first to strike Cumilla schoolboy Ishayat Shahriar Apratim on the head with the intention of killing him in order to snatch the iPhone he was carrying, police say.

Two other teenagers arrested in the case subsequently joined in the attack, law enforces said.

Police Superintendent Md Anisuzzaman shared the information around 2:15pm on Sunday at the District Police Superintendent's office.

Police had earlier said that four people were detained on suspicion of involvement in the murder of 13-year-old Apratim, the son of Nahida Begum, an associate professor in the Department of Bengali at Comilla University.

An iPhone belonging to Apratim was also recovered from those detained. ...