The plane crash is the first major test for South Korea’s acting president, Choi Sang-mok, who had been appointed the interim leader only on Friday, as the country grapples with a political crisis at the highest levels.

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       Choi Sang-mok, South Korea’s acting president, after an emergency meeting in Seoul on Sunday.Credit...Yonhap/EPA, via Shutterstock

       Mr. Choi, who arrived at the site about 190 miles from Seoul around midday Sunday, ordered government agencies to mobilize all equipment and personnel available for rescue efforts, according to his office.

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