All 181 passengers and crew aboard a passenger jet that crashed upon landing in South Korea on Sunday morning are presumed dead except for two people rescued from the wreckage, authorities said.

Investigators will try to determine what happened on the plane, including how its mechanical systems were functioning and what actions the pilots took.

The Jeju Air jetliner was carrying 175 passengers and six crew when it crash-landed at Muan International Airport just after 9 a.m. local time Sunday.

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.

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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.

One was a 33-year-old man, with the surname Lee, who was rushed to a hospital in Mokpo, about 25km (15.5 mi) south of the airport, but was later transferred to Ewha Womans University Seoul Hospital in the capital, Yonhap news agency reported.

South Korean authorities requested a warrant to apprehend and detain President Yoon Suk Yeol over his declaration of martial law earlier this month.

Sunday after a JeJu Air passenger jet crash-landed at a South Korean airport. Only two people survived. Now, officials are working to figure out the cause.

An Air Canada flight experienced a suspected landing gear issue at Halifax Stanfield Airport, leading to an emergency landing and passenger evacuation.