Saif-al-Islam, arrested in the "Southern Libya" and was wanted by the International Criminal Court, said Mohammed al-Allagui, NTC justice minister, who declined to divulge more details.
A warrant was issued against Saif-al-Islam by the ICC on Jun 27 apart from his father and Abdullah al-Senussi, Gaddafi's intelligence chief over the charges of crimes against humanity.
Gaddafi was killed near his hometown in Sirte by NATO. His son and Defence Minister were also killed in their fight. All three were buried on Tuesday, Oct 25 in an undisclosed location in the Libyan desert.
According to officials several of Gaddafi's remaining relatives attended his funeral but did not reveal the location fearing that it would become a symbolic shrine for his remaining loyalists.