Chairman of Libya's National Transitional Council (NTC) Mustafa Abdel Jalil said Monday that a committee will be set up soon to investigate the death of former Libyan leader Muammar Gaddafi.

Speaking at a press conference held in Benghazi, Jalil said that in response to international calls, the NTC has started to form a committee to look into the circumstances of Gaddafi's killing after he was captured in Sirte last week.

Jalil also said a new interim government is expected to be formed within about two weeks.

Jalil said that "those who helped Muammar Gaddafi" have played an effective role in killing him. The NTC chief did not elaborate on his claim.

As Jalil stated the NTC's intention of investigating the circumstances of Gaddafi's death, the corpses of the ex-leader and his son Mutassim are still being put on display in a house in the western Libyan city of Misrata, starting to rot and stink.

A Reuters report said NTC fighters guarding the corpses Monday "placed plastic sheeting under them as fluids leak."

The footage of Al Jazeera TV showed that people are still being allowed into the temporary morgue to visit and take photos.