The death toll in South Korean plane crash has increased by one in the last few moments, meaning 177 have been confirmed dead after the crash.
181 people were on the plane in total - with two survivors having been taken to the hospital earlier.
Witnesses who spoke to South Korea's Yonhap news agency said they saw sparks and heard an explosion before the crash.
Yoo Jae-yong, 41, who was staying near the airport, tells Yonhap he saw a spark on the right wing shortly before the crash.
Kim Yong-cheol, 70, tells the agency the plane failed to land initially and circled back to try again.
Kim says he saw "black smoke billowing into the sky" after hearing a "loud explosion".
"I saw the plane descending and thought it was about to land when I noticed a flash of light," another witness named Cho adds. "Then there was a loud bang followed by smoke in the air, and then I heard a series of explosions."
Acting president Choi Sang-mok, who held an emergency meeting in Seoul on Sunday and shortly after declared a special disaster zone in Muan.
He only became the leader of the country on Friday - the result of a political crisis that has gripped South Korea for the past three weeks.
Former acting president Han Duck-Soo was impeached on Friday. He was in the role for two weeks, stepping in after President Yoon Suk Yeol was impeached by lawmakers on 14 December following a disastrous attempt to impose martial law.
Choi has now stepped into the breach. On Sunday he instructed his government to use all equipment and personnel available to rescue as many people as possible from the Jeju Air crash site.
“We have a grave situation where a great loss of life occurred after a plane went off the runway in Muan airport," he said.
"I express my deepest condolences to the many victims in the incident. I will do all I can for the injured to quickly recover."
