A federal judge will keep a Rwanda man, convicted last week for naturalization fraud, in custody pending sentencing after hearing testimony Thursday that he has a pending arson charge in state court. The man also allegedly has a previous conviction and outstanding warrant for his participation in the 1994 genocide in Rwanda.Homeland Security Special Agent Michael Fischels testified agents traveled to Rwanda during the investigation of Gervais “Ken” Ngombwa, 56, to verify documents of Ngombwa’s conviction in the “Gacaca court,” community courts of Rwanda, for participation in transporting militia members involved with the genocide of nearly 1 million Rwandans.