Family members of the murdered Delwar Hossain, executive engineer of Gazipur City Corporation (GCC), yesterday demanded arrest of masterminds behind the murder and an in-depth investigation to ensure justice.

Delwar's wife and three sons made the demand at a press conference at an auditorium of the Institution of Engineers, Bangladesh (IEB) in the capital.

 Reading a written statement, Delwar's wife Khadiza Akhter said, those who were directly involved with the killing have already been arrested but the masterminds are still trying to influence the investigation to avoid arrest.

"I demand justice for my husband through the punishment of all killers and conspirators behind the murder," she said, terming Delwar an honest officer.

Khadiza alleged that some employees of GCC and unidentified people are calling her cell phone number, telling her not to demand in-depth investigation. "Due to this reason, we are concerned about [getting] an impartial investigation," she added.

"An assistant engineer (one of the arrestees of the case) can not kill his senior officer only for a silly matter, so we want arrest of all masterminds," she said.

IEB vice president SM Monjurul Haque Monju  also spoke at the press conference.

 After the press conference, at least 100 engineers formed a human chain in front of IEB, demanding justice for Delwar.  

On May 21, police claimed to have arrested three people, including an assistant engineer of GCC, in connection with the murder.

On May 11, a team of Turag police of Dhaka Metropolitan Police (DMP) had recovered the body from Beribadh, which was later identified using fingerprint matching to be Delwar.