Dhaka, Dec. 19 -- United Nations High Commissioner for Human Rights Volker Turk has called for a "prompt" and "thorough" investigation into the killing of Inqilab Moncho Convenor Sharif Osman bin Hadi.

In a statement issued on Friday, Turk also demanded that the perpetrators of the attack be held accountable following the due process of law.

"Retaliation and revenge will only deepen divisions and undermine the rights of all," Turk was quoted in the statement.

"I urge the authorities to conduct a prompt, impartial, thorough, and transparent investigation into the attack that led to Hadi's death, and to ensure due process and accountability for those responsible."

Hadi, a frontline fighter of the July Uprising that toppled the Awami Lea...