BUDAPEST, Hungary — A Hungarian teacher who pulled some students out of a fiery bus in Italy despite getting burned and losing his own two children in the crash was being hailed as a hero Monday as Hungary held a national day of mourning for the 16 victims. Gym teacher Gyorgy Vigh was among the 56 people on the bus carrying mostly students from Budapest’s Szinyei Merse Pal high school home after a skiing trip to France. The causes of Friday night’s accident near the northern Italian city of Verona — in which the bus crashed into a guardrail before smashing into an overpass support column and bursting into flames — are still unknown. Vice Principal Gabor Jaki described Vigh as “a man of action, a cheerful person ...