Flight 2216 from Bangkok to Muan broke up in a fiery ball of flames after colliding with a concrete installation at the end of the runway following a mayday call and emergency belly-landing.

The exact cause of the Boeing 737-800 crash is still unknown, but investigators have pointed to a bird strike, faulty landing gear, and the barrier at the end of the runway as possible issues.

Using large yellow cranes, investigators began lifting sections of the plane's scorched fuselage Friday, including what appeared to be an engine and the tail section.

"Today, we will lift the tail section of the plane," said Na Won-ho, head of investigations for the South Jeolla provincial police.

"We expect there may be remains found in that section," he told a press conference at Muan International Airport, where the crash happened.

"For all that to be complete and to have the results, we must wait until tomorrow."

Because of the violent destruction of the aircraft, officials said some of the bodies suffered extreme damage, and it was taking investigators time to piece them together while also preserving crash site evidence.

All 179 victims have been identified, however, and some bodies have been released to families for funerals to begin.

Police have vowed to quickly determine the cause and responsibility for the disaster, but the transport ministry said it could take six months to three years.

- BTS support -

Police on Thursday conducted a series of raids on the offices of Jeju Air and the Muan airport operator as they stepped up their probe.

Police were securing evidence on the airport's localizer -- a concrete wall housing an antenna array at the end of the runway -- as well as communications between the control tower and cockpit before the crash, Yonhap reported.

Officials are also inspecting all Boeing 737-800 aircraft operated by South Korean carriers, focusing on the landing gear.

The investigation is headed by South Korean air safety officials, with the assistance of the US Federal Aviation Administration, which frequently aids with probes into global plane crashes.

China's Civil Aviation Administration, meanwhile, announced Friday it was also taking measures in response to the Jeju Air crash.

It "comprehensively investigated runways for safety hazards" and "strengthened the... effectiveness of bird strike risk prevention", state broadcaster CCTV reported, citing the administration's safety director Shu Mingjiang.

In Muan, relatives of the victims visited the crash site to pay their respects and collect the belongings of their loved ones.

The disaster has spurred an outpouring of national support in South Korea, with a period of mourning lasting until Saturday and donations flooding in for victims' families.

J-Hope, a member of K-pop megagroup BTS, sent 100 million won ($68,000) to the families as a "small measure of support", according to the local Korea Herald newspaper.

In other acts of kindness, some Koreans had remotely pre-paid for coffee at the airport's cafe so the victims' families could drink without paying, while star chefs from Netflix hit "Culinary Class Wars" prepared meals.

ms-tmt-jfx/fox

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