Dhaka: Detective Branch (DB) has started investigating the case for killing teenage boy Rajon.

DB Inspector Suranjit Talukder, also investigation officer of the case, collected the files of the case from Jalalabad Police Station on Thursday morning, said Akhter Hossain, officer-in-charge of the police station.

From now DB will investigate the case, added the OC.

Earlier, the 13-year-old boy, Sheikh Samiul Alam Rajon, son of Sheikh Azizur Rahman of Badeali village in sadar upazila, was brutally tortured to death over theft at Sundar Ali Market in Kumargaon area of the city on 8 July.

After the incident, Jalalabad police filed a case against four people in this connection.