Preparations for the trial of Saadi Gaddafi, the son of late Libyan strongman Muammar Gaddafi, began on Thursday immediately after he was handed over by Niger, a Libyan official stated.

"Preparations for Saadi's trial have already started," Al-Seddiq al-Sewar, spokesman for the Libyan prosecutor-general and head of Libya's Investigations Office said.

He added that Gaddafi's son had been placed in a jail in the capital Tripoli.

Earlier today, Libya officially received Saadi from neighboring Niger where he had been hiding since the collapse of his father's regime.

Saadi fled to Niger in September 2011 – one month before the murder of his father and the fall of his regime.

Niger, Libya's southern neighbor, had earlier granted Saadi asylum for "humanitarian reasons," and rejected Tripoli's demands to extradite him – despite an arrest warrant issued by Interpol at Libya's request.

According to al-Sewar, Saadi is accused of helping his father suppress Libya's February 17 Revolution, which eventually ended Gaddafi's four-decade rule.

"He will have all the guarantees for a fair trial, including defense lawyers," noted without saying when exactly the trial would begin.