Libya's new rulers on Thursday stepped up the hunt for Muammar Gaddafi's inner circle, seeking the arrest of one of his sons, Saadi, and announcing the capture of his spokesman Mussa Ibrahim. World police body Interpol issued an arrest notice Thursday for fallen Libyan leader's son Saadi for alleged crimes while head of the country's football federation. The new Libyan authorities requested the notice against Saadi, believed to be in Niger, “for allegedly misappropriating properties through force and armed intimidation when he headed the Libyan Football Federation,” Interpol said in a statement. Saadi, 38, was last seen in Niger and the red notice calls particularly on countries in the region to help locate and arrest him “with a view to returning him to Libya where an arrest warrant for him has been issued,” Interpol said. Interpol said it was the first red notice issued at the request of the National Transitional Council, with previous such notices issued for Gaddafi himself and other members of his family at the request of the International Criminal Court. Niger's government said on September 16 that it would not send Saadi back to Libya, but could hand him over to another jurisdiction. The new Libyan rulers also said another Gaddafi son, Mutassim, was in the deposed despot's birthplace of Sirte, where old regime loyalists fought pitched battles with combatants loyal to the ruling National Transitional Council. “Misrata fighters contacted us and gave us the information that Mussa Ibrahim has been captured,” said Mustafa bin Dardef, of the National Transitional Council's Zintan Brigade.