Feels like Mohamar had as many sons as there are second in command Al Quada.
Saif al-Islam Gadhafi was arrested in the southern border town of Obari in a desert oasis near the Niger border, Voice of America and CNN reported.
The International Criminal Court in The Hague has an outstanding warrant on Saif for alleged crimes against humanity under his late father's 42-year dictatorship.
Saif al-Islam is the second-oldest son born to Gadhafi's second wife. He was widely seen as the successor to his father, who was killed by transitional forces Oct. 20 as part of the pro-democracy conflict that began in February.