By Soo-hyang Choi, Daewoung Kim and Hongji Kim SEOUL (Reuters) - South Korea's President Yoon Suk-yeol declared a period of national mourning on Sunda.
A mass of mostly young people celebrating Halloween festivities in Seoul became trapped and crushed as the crowd surged into a narrow alley, killing at least 146 people and injuring 150 others in South Korea s worst disaster in years.