The International Criminal Court (ICC) has called for the arrest and surrender of Saif al-Islam Gaddafi, who was released by a militia in Libya last week after six years in jail.
The son of late leader Col Muammar Gaddafi is wanted for alleged crimes against humanity during the rebellion that ousted his father in 2011.
His location is unclear. The UN-backed government has condemned the release.
It is feared that the move could fuel further instability in the country.
Saif al-Islam was freed from jail last Friday by the Abu Bakr al-Siddiq Battalion militia in the western town of Zintan under an amnesty law.
He has not been seen in public since then. A source told the BBC he was in the Tobruk area of eastern Libya.