South Korean officials are struggling to determine what caused a deadly plane crash that killed nearly 180 people on board, with the nation saddened, shocked and ashamed over the country’s worst aviation disaster in decades.

The flight, operated by Jeju Air, was landing when it went off the runway in Muan, in the country’s southwest. Only two people survived the crash.

All 179 victims from the Jeju Air crash in South Korea have been identified, authorities said, including entire families and a 3-year-old boy.Only two people — both crew members, one male and one female,