BUDAPEST, Hungary — It could take days to officially identify the 16 people killed when a bus carrying Hungarian students returning from a ski trip burst into a fireball after crashing in Italy, Hungary’s foreign minister said Sunday. There were 54 passengers and two Hungarian drivers on the bus that crashed on an Italian highway near Verona just before midnight Friday, Foreign Minister Peter Szijjarto said. Szijjarto said one of the unidentified adults in critical condition suffered third-degree burns on over 60 percent of his body, while the other person had undergone surgery for a serious head injury. Italian officials said the bus burst into flames after hitting a highway barrier and then ramming into an overpass support column. Judit Timaffy, the Hungarian consul in Milan, said a “hero professor” identified as physical education teacher Gyorgy Vigh dashed repeatedly into the bus pulling students to safety.