KINSHASA, Congo (AP) — Italian Carabinieri experts were joining U.N. and Congolese authorities in investigating the killings of the Italian ambassador, his bodyguard and their driver in eastern Congo. There are questions about the dynamics of Monday’s attack and security precautions taken for the convoy. The two-car World Food Program convoy was travelling Monday from Goma, the regional capital in the east, when an armed group blocked their passage and ordered the passengers out. The Congolese driver was immediately killed with the Italian ambassador and Carabinieri security escort killed in an ensuing shootout. But how events unfolded exactly remain unclear. U.N. spokesman Stephane Dujarric said the U.N. had launched an internal review concerning the “security around the incident.”