Rwandan President Paul Kagame has threatened a « showdown » with France after French investigators said they would reopen a probe into the 1994 assassination of president Juvenal Habyarimana … The shooting-down of Habyarimana’s plane, in which Burundian President Cyprian Ntaryamira and the French crew also died, sparked the massacres that claimed 800,000 lives, most of them Tutsi,…