Factbox-Some of South Korea's major disasters and accidents

A parent of a victim reacts at a community service center after a stampede during Halloween festivities in Seoul, South Korea, October 30, 2022. REUTERS/Kim Hong-Ji

SEOUL (Reuters) - South Korean President Yoon Suk-yeol declared a period of national mourning on Sunday after a crush of Halloween partygoers killed 151 people in a packed nightlife area in Seoul overnight.

South Korean leaders have pledged to change how the country operates after a series of major accidents and disasters tarnished the image of a nation that rose to wealth from the rubble of a war in a few decades.