Aeroflot, the Soviet Union's national carrier, experienced a number of serious accidents and incidents during the 1970s. The airline's worst accident during the decade took place in August 1979, when two Tupolev Tu-134s were involved in a mid-air collision over the Ukrainian city then named Dniprodzerzhinsk, with the loss of 178 lives. Including this event, there were nine deadly incidents with more than 100 fatalities, while the total recorded number of casualties was 3,541 for the decade.