South Korean acting President Choi Sang-mok on Monday ordered an emergency safety inspection of the country's entire airline operation system as investigators worked to identify victims and find out what caused the deadliest air disaster in the country.

All 175 passengers and four of the six crew were killed when a Jeju Air Boeing 737-800 belly-landed and skidded off the end of the runway at Muan International Airport, erupting in a fireball as it slammed into a wall. Two crew members were pulled out alive.

The top priority for now is identifying the victims, supporting their families and treating the two survivors, Choi told a disaster management meeting in Seoul.