Moammar Gadhafi's former heir apparent has been captured by revolutionary fighters in Libya's southern desert, just over a month after his father was killed.
As news of his capture spread, celebratory gunfire shook the capital, Tripoli, and other Libyan cities.
Seif al-Islam Gadhafi now faces the prospect of trial before an international or Libyan court to answer for the alleged crimes of his late father's regime.
The prosecutor for the International Criminal Court tells The Associated Press that he will travel to Libya next week for talks with the country's transitional government on "where and how" Seif al-Islam will be tried. The court charged him in June with unleashing a campaign of murder and torture to suppress the uprising against the Gadhafi regime.
The State Department says he should be held accountable for his actions but urged the Libyans to treat all prisoners in full accordance with international standards.
His capture leaves only one member of the ousted regime still on the international court's wanted list, former intelligence chief Abdullah al-Senoussi.