Anwarul Azim went to Kolkata on May 12 and was murdered the next day in a flat in Sanjiva Garden in New Town, Kolkata.
The Kolkata police informed the Bangladesh police about the case after checking the CCTV camera footage of the flat and other details. Later, the detective branch of the DMP arrested three suspected criminals from Dhaka.
During the investigation, the police got information about the murder of Anwarul Azim and the disposal of his body. Officers involved in the investigation said that after the murder, Anwarul's body was cut into pieces and taken away in bags. Some parts were thrown into a canal in Kolkata.