A mass of mostly young people celebrating Halloween in Seoul became trapped and crushed as the crowd surged into a narrow alley, killing at least 151 people and injuring 82 others in South Korea's worst disaster in years. Emergency workers and pedestrians desperately performed CPR on people lying in the streets after the crush in the capital's nightlife district of Itaewon on Saturday night. Those killed or hurt were mostly teens and people in their 20s, according to Choi Seong-beom, chief of Seoul's Yongsan fire department.