At least 154 people were killed on Saturday night in Seoul, South Korea, as revelers crowded into a narrow alleyway in the city’s Itaewon district to celebrate their first Halloween in three years with few Covid-19 restrictions. Photo: Kim Hong-ji/IC photo

Rescue personnel transfer a survivor on Sunday. Around 149 people were injured, of which 33 were in serious conditions. Photo: Jeon Heon-kyun/IC photo

Survivors sit on the ground. Many of the killed or hurt revelers were teenagers or adults in their twenties, Choi Seong-beom, chief of Seoul’s Yongsan fire department, said. Photo: Kim Hong-ji/IC photo

Rescue personnel gather in the Itaewon district following the incident. Photo: VCG

Rescue teams work at the alleyway where people were killed and injured in the crowd surge. The alley measured around 40 meters in length and 3.2 meters in width. Photo: VCG

Police officers investigate the scene on Sunday. They identified all of the 154 victims the day after. Four Chinese were among the 26 foreign nationals who died during the incident. Photo: Lee Jin-man /VCG

South Korean President Yoon Suk-yeol visits the scene of the incident on Sunday morning, the day he declared a period of national mourning for the victims. Photo: VCG

A man bows in prayer for victims on Sunday afternoon at a memorial site near the Itaewon subway station. Photo: VCG

Former U.N. secretary general Ban Ki-moon leaves a memorial site after offering flowers for the victims at Seoul City Hall Plaza on Monday. Photo: VCG