French and Romanian police said Friday they have arrested five people in a probe into the killing of a son of Chad's President Idriss Deby. Four people were arrested in the Paris region on Wednesday, according to a Paris police official. He spoke on condition of anonymity because of agency policy. Another suspect, a French-Romanian national, was arrested in Romania several days ago on a French warrant, Romanian police said. A Romanian court will decide when the suspect will be handed over to French authorities. Brahim Deby, the eldest son of Chad's president, was found dead in the basement of his apartment building in a Paris suburb in July 2007. He was asphyxiated by chemicals from a fire extinguisher that lay near his body. The suspects are believed to have been in the garage of the apartment building when he was found, the French police official said. The motive for the killing may have been theft and not political, but the investigation continues, French police said.