Libya will not hand over Moammar Gadhafi's most prominent son Seif al-Islam to the International Criminal Court for trial, interim justice minister Mohammed al-Allagui said on Tuesday.

His comments came as the court's chief prosecutor Luis Moreno-Ocampo was in Tripoli for talks on jurisdiction in the case of Seif and Gadhafi's spymaster Abdullah al-Senussi, both of whom are wanted by the court on charges of crimes against humanity.

Osama Juili, who commands the hilltown fighters who captured Moammar Gadhafi's most prominent son at the weekend, is set to be named defense minister, sources in Libya's interim government said Tuesday.

And the post of foreign minister is to be handed to Libya's ambassador to the United Nations, Ibrahim Dabbashi, according to the sources in the National Transitional Council.

The International Criminal Court's chief prosecutor arrived in Tripoli on Tuesday to meet Libyan authorities following the arrest of Moammar Gadhafi’s son Seif al-Islam, his office said.

Luis Moreno-Ocampo and deputy prosecutor Fatou Bensouda head a delegation whose aim is to coordinate their efforts after the arrest of Seif al-Islam and unconfirmed reports regarding the arrest of Abdullah al-Senussi.

The United States is investigating whether Iran sent hundreds of special artillery shells for chemical weapons to the late Moammar Gadhafi regime in Libya, The Washington Post reported late Sunday.

The shells, which Libya had filled with mustard gas, were discovered in recent weeks at two sights in central Libya, the Post said citing unnamed U.S. and Libyan officials.

Moammar Gadhafi’s spymaster Abdullah Senussi was arrested on Sunday, Libyan officials announced and said that the dead dictator's son captured the previous day would face trial in Libya.

Ignoring world pressure, Libya's interim rulers insisted that Seif al-Islam, Gadhafi’s one-time heir apparent, would be tried inside Libya rather than at the International Criminal Court at The Hague.

Russia's point man on Africa said Saturday that Moscow was relieved that murdered Libyan strongman Moammar Gadhafi's son Seif al-Islam had been arrested and had escaped "summary justice".

"We are happy that this time the new authorities in Libya did not resort to summary justice for Seif al-Islam, the son of the ousted leader Gadhafi," the Russian presidency's special representative for Africa Mikhail Margelov said.

Libya's interim Prime Minister Abdel Rahim al-Kib said Saturday that Seif al-Islam Gadhafi, the son of the slain leader of Libya, will be given a "fair trial."

"I reassure our people and the world that Seif, and those with him, will be given a fair trial in which international rights and norms will be guaranteed," Kib told a news conference in Zintan after formally announcing the arrest of Moammar Gadhafi's favorite son.

Honking cars, tears of joy and praise to Allah: in the cradle of the Libyan uprising the capture of Seif al-Islam, the old regime's favorite son, was celebrated with joyous relief.

As the news spread, cars gravitated to Benghazi's Tahrir Square from all over, passengers hanging through rolled-down windows waving Libya's new flag.

Moammar Gadhafi's son Seif al-Islam has been captured, Libya's new authorities announced on Saturday, ending a three-month manhunt for the murdered dictator's longtime heir apparent.

Video footage showed the younger Gadhafi, who is wanted by the International Criminal Court on charges of crimes against humanity, being hauled off into captivity in a northwestern hill town after getting off a flight from the desert south where he was seized.

Libya's new government is to be announced by Monday "at the latest," an official of the ruling National Transitional Council said on Saturday.

Fathi Baja, in charge of political affairs for the NTC, said the list being drawn up by interim premier Abdul Rahim al-Kib was "more or less ready."