He said the ICC had received different information from the various rebel factions about Saif al-Islam's purported arrest and whereabouts.
BBC: Libya conflict: Defiant Saif al-Islam Gaddafi reappears
Defence counsel for Saif al-Islam Gaddafi at the International Criminal Court have alleged that he is being mistreated in custody in Libya.
BBC: Gaddafi son 'attacked in custody' in Libya, ICC lawyers say
Saif al-Islam was considered the most likely successor to Col Gaddafi before the uprising that led to his father's downfall last year.
Saif al-Islam Gaddafi, the son of former leader Col Muammar Gaddafi, has appeared before a court in Libya, the public prosecutor's office has said.
Mr Baara said there had been "no intervention by the ICC" in the investigations and that Libyan prosecutors had "solid proof" to try Saif al-Islam.
Saif al-Islam Gaddafi, the son of former leader Col Muammar Gaddafi, will go on trial in Libya in September, a Libyan prosecution spokesman has said.
The Zintan militia have refused to hand Saif al-Islam over to Tripoli, while the Libyan government is rejecting ICC demands to try him in The Hague.
Libya and the ICC have been going back and forth since his capture about where Saif al-Islam Gadhafi, once his father's heir apparent, will be tried.
On Monday, the chief prosecutor for the International Criminal Court (ICC) said he was negotiating with the rebels for Saif al-Islam's transfer to The Hague.
BBC: Libya conflict: Defiant Saif al-Islam Gaddafi reappears
Zintan's fighters have so far declined to turn the captured Saif al-Islam over to the central authorities and may be using him as a bargaining chip.
In the interview, Saif al-Islam referred to Mr Sarkozy as "this clown" and said he was given assistance so that he could help the Libyan people.
One of the four, Australian lawyer Melinda Taylor, was accused of passing Saif al-Islam coded documents, allegedly written by his former right-hand man, during the team's visit.
The son of deposed Libyan leader Col Muammar Gaddafi, Saif al-Islam, has briefly appeared in court to face criminal charges and has been appointed two local lawyers.
Israeli tabloids make much of reports that Saif al-Islam, the colonel's son and oft-presumed heir, used to date Orly Weinermann, a sometime scantily clad Israeli soap-opera actress.
ECONOMIST: The colonel has sympathisers in an unexpected place
Mr Moreno-Ocampo earlier expressed fears that Saif al-Islam might decide against surrendering to the ICC and try to escape to a friendly country with the help of mercenaries.
For its part, the Libyan government says a special court is being built to try Saif al-Islam and it is fitting that he should be tried on Libyan soil.
BBC: Gaddafi son 'attacked in custody' in Libya, ICC lawyers say
The statement from Saif al-Islam's defence counsel said that both they and the defendant had been informed earlier that there was not enough evidence to pursue him for "serious crimes".
BBC: Gaddafi son 'attacked in custody' in Libya, ICC lawyers say
Libya has resisted the ICC's request to extradite Saif al-Islam for trial in The Hague, saying it wants to prosecute him at home, where he could face the death penalty.
Even the televised speeches by Saif al-Islam and Mr Qaddafi himself, while more chilling in tone, echoed performances by Zine el-Abidine Ben Ali of Tunisia and Hosni Mubarak of Egypt.
Libyan authorities have been involved in a tussle with the International Criminal Court over where Gaddafi's son, Saif al-Islam, should stand trial over his role in the uprising that ended his father's rule.
Ms Taylor was appointed by the ICC to help prepare the defence of Saif al-Islam, who was captured by the Zintan militia last November as he tried to flee the country.
Mr Moreno-Ocampo said the ICC had learnt "through informal channels" that mercenaries were offering to move Saif al-Islam to a country that has not signed up to the ICC's Rome statute.
He had a lower profile than most of his brothers, particularly Saif al-Islam, who studied at the London School of Economics and has issued several public statements since the uprising began.
Col Gaddafi's son Saif al-Islam, who was seen as a reformer during his father's rule, has been held by militiamen in the western town of Zintan since his capture at the end of 2011.
BBC: Libya PM's aide Mohamed al-Ghattous freed by kidnappers
Gadhafi's son Saif al-Islam visited Washington, and his suave and murderous intelligence chief Musa Kusa (Michigan State University class of '78, and more recently Libya's foreign minister) was allowed back into the U.S. All sanctions ended.
Gadhafi's brother Saif al-Islam Gadhafi, once seen as their father's heir apparent, is in Libyan custody and is the subject of a tussle between Libya and the International Criminal Court, both of which want to put him on trial.
Recently Saif Al-Islam Qaddafi, influential son of and possible successor to Libyan leader Muammar Qaddafi, paid a private visit to the U.S. His trip also coincided with the removal of the last barriers to normal relations--diplomatic, economic, political--between our two countries.
The appeal document also seeks to answer ICC concerns about Saif al-Islam Gadhafi's well-being, saying the government "has expended considerable resources in order to ensure the safe and secure temporary custody" of Gadhafi in Zintan and is negotiating to bring him to the capital, where facilities would be better.
The Libyan government wants to prosecute Gadhafi itself, as it "regards the trial of Saif al-Islam and Abdullah al-Senussi as a matter of the highest national importance, not only in bringing justice for the Libyan people but also in demonstrating that the new Libyan justice system is capable of conducting fair trials (that meet all applicable international standards) in complex cases, " it says.
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