The chief prosecutor of the International Criminal Court (ICC) has arrived in Libya to discuss the case of Saif al-Islam, son of former leader Col Muammar Gaddafi.
Libya’s interim government has refused to hand over Saif al-Islam for trial in the Netherlands – seat of the ICC.
Saif al-Islam, who was captured last November, has been indicted by the ICC for crimes against humanity.
Libya has insisted he should be tried by a Libyan court.
The BBC’s correspondent in Tripoli, Jon Donnison, says the Libyan administration will be keen to show Luis Moreno Ocampo that it is capable of trying the country’s most high profile prisoner.
The country’s justice ministry says a deal is close to being reached where the former dictator’s son would be tried in Libya, but with supervision from the ICC.
Mr Gaddafi is still being held in western Libya by the militia group that captured him as he tried to flee the country.
The group has given no indication of when they might hand him over to the Libyan government.
Set up in 2002, the ICC made its first successful conviction last month, when Congolese militia leader Thomas Lubanga was found guilty of recruiting child soldiers.