Relatives gathered to mourn the 62 victims of a passenger jet crash in southern Russia on Sunday and officials warned an investigation could take weeks to determine the cause of the downing At Rostov-on-Don airport about 400 people paid their respects to the 55 passengers and seven crew who died in the crash operated by Dubai-based budget carrier Flydubai crashed in the early hours of Saturday At the crash site, Russian workers finished their search of the snow-covered wreckage having sifted more than 200 pieces of the victims' bodies scattered across the airfield