GE Aerospace, whose joint venture made the engines of the Boeing airplane that crashed in the deadliest aviation disaster on South Korean soil, joined the investigation as Seoul extended by a week special inspections of all 101 Boeing 737-800 jets.

Jeju Air’s flight 2216 crash landed at South Korea’s Muan International Airport on Dec. 29 killing 179 of the Boeing plane’s 181 passengers

Boeing shares were down as much as 6% Monday morning. Authorities in Korea believe a bird strike could have been a factor in the fatal crash.

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.

Shares of Boeing fell in early trading on Monday, one day after a Boeing model 737-800 was involved in the Jeju Air plane crash in South Korea that killed scores of passengers. The slide came hours after South Korea's transportation ministry announced it would investigate the crash and conduct a full inspection of all Boeing 737-800 aircraft in use in South Korea.

SEOUL, South Korea (AP) — A team of U.S. investigators including representatives from Boeing have examined the site of a plane crash that killed 179 people in South Korea while authorities were conducting safety inspections on all Boeing 737-800 aircraft operated by the country’s airlines.

South Korean investigators on Friday began lifting the wreckage of the Jeju Air plane that crashed five days ago, killing 179 people in the worst aviation disaster on its soil, AFP reporters saw.