Saadi Kadhafi speaks during a news conference in Tripoli, Libya, in January 2010.

(CNN) — Saadi Gadhafi, one of the surviving sons of ousted Libyan leader Moammar Gadhafi, has been placed under house arrest in Niger, Libya’s transitional government said Sunday.

Saadi Gadhafi has been in Niger since September, following the collapse of his father’s 42-year regime. The central African country granted him asylum, arguing he should be treated like other Libyan refugees, but Libya’s National Transitional Council has demanded his extradition.

Nigerien authorities had no comment on Sunday’s Libyan statement announcing the arrest.

Saadi Gadhafi was a prominent businessman and onetime head of Libya’s national football league before his father’s government fell to a six-month revolt in late August. The new Libyan government has accused him of misappropriating properties through force and armed intimidation, and the multinational police agency Interpol issued a “red notice” calling for his arrest in September.

The elder Gadhafi was killed by NTC fighters in October, along with his son Mutassim. Another son, Khamis, was reported killed in battle as the regime imploded in August.

Gadhafi’s second eldest son and closest adviser, Saif al-Islam Gadhafi, is now awaiting trial in Libya, while his wife, three other children and several grandchildren have fled to neighboring Algeria.