Tripoli, Libya (CNN) -- The United Nations and two major human rights groups called Friday for an investigation into the death of Moammar Gadhafi amid questions over the final moments of the late Libyan strongman's life.
"There seem to be four or five different versions of how he died," the Office of the U.N. High Commissioner for Human Rights said in a statement. "More details are needed to ascertain whether he was killed in the fighting or after his capture."

Questions also persisted about what would happen to Gadhafi's body. His family issued a statement Friday calling on the United Nations and Amnesty International to push Libya's new leadership "to hand over the bodies of the martyrs of their tribe so they can be buried according to Islamic rites," a pro-Gadhafi TV station reported.

Libya's interim government, the National Transitional Council, has said Gadhafi's burial will be delayed for a few days to allow International Criminal Court officials to check the body in Misrata if they choose to do so.
The whereabouts of Gadhafi's son Saif al-Islam was also in question Friday.

The International Criminal Court wants the son for crimes against humanity. Revolutionary fighters said they were on his trail and would capture him soon.