Libya's prime minister hailed the capture of Muammar Gaddafi's son as the "crowning" of the Libyan uprising and promised a fair trial for Saif al-Islam, who was found in the southern desert.
In the first official announcement of Saif al-Islam's capture, Abdel Rahim al-Kib said he hoped it would "turn the page on the phase of revolution and will mark the beginning of the building of a state of freedom, law, justice and transparency.
"I want to assure our people and all nations of the world that Saif and those with him will be given a fair trial, with the guarantees of local and international law - those legal processes which our own people were deprived of," he told a news conference in the Western mountain town of Zintan, where Saif al-Islam and several bodyguards had been taken.
The West has urged Libya's new rulers to give Saif al-Islam a fair trial and work with the International Criminal Court in The Hague to bring him to justice.
Asked if Saif al-Islam would face the death penalty, Mr Kib said: "I am not an expert on that."
The International Criminal Court's chief prosecutor Luis Moreno-Ocampo will visit Libya in a week to discuss the prosecution.
"I'm going to Libya to discuss how we manage this issue. But the news is that Saif will get justice. Where and how, that we will discuss," Mr Moreno-Ocampo told reporters in The Hague.
The ICC has indicted Saif al-Islam for crimes against humanity over the killing of civilian protesters.
Fighters from the western mountain city of Zintan captured the British-educated 39-year-old, Saif, who a year ago seemed set for a dynastic succession to rule.
He and three armed companions were taken without a fight overnight, officials said.
A picture aired on Libyan TV showed what appears to be Saif al-Islam with an injured hand. He said that the injuries were sustained a month ago as he fled the town of Bani Walid during a NATO air strike on the then pro-Gaddafi stronghold.
The Zintan fighters, one of the powerful militia factions in Libya, said they would hold on to their prisoner until there was an administration to hand him over to.
NTC pledges to unveil new government by Monday
Meanwhile, the NTC has pledged to unveil the country’s new government by Monday "at the latest”.
Fathi Baja, in charge of political affairs for the NTC, said the list being drawn up by interim premier Abdel Rahim al-Kib was "more or less ready."
It would be submitted to the NTC for approval "tomorrow (Sunday), inshallah (God willing)," or "on Monday at the latest" if adjustments were necessary, he told AFP.
Mr Baja said the prime minister was playing his cards close to his chest and had been working "in secret" on the cabinet list.
The NTC, whose rebel fighters backed by NATO air support toppled Gaddafi in October, chose Mr Kib - a university professor from Tripoli - on 31 October to form an interim government.
Mr Kib has said the new government will be formed of technocrats, but he has come under pressure from Libya's tribes and numerous armed factions which are demanding a role.
