Emergency services attend to the victims of an incident that resulted in dozens of deaths during the Halloween celebrations. (CNN) — At least 59 people were killed in an incident during Halloween celebrations in Seoul’s Itaewon neighborhood on Saturday night, according to the chief of the Yongsan Fire Department. In addition, at least 150 people were injured, he added. the same source. The cause of death was not immediately known, but the fire chief said many people collapsed amid the Halloween festivities, resulting in fatalities. The Yonhap News Agency had previously reported that people suffered “cardiac arrests,” attributing the information to fire authorities. Emergency officials received at least 81 people from the Itaewon neighborhood with “difficulty breathing.” Authorities have not yet given precise details about the cause of the incident. Police sealed off the area of Seoul’s Itaewon neighborhood. Videos shared on social media showed people lying in the streets. South Korean President Yoon Suk Yeol sent a disaster medical assistance team to the incident, according to the presidential office. The president also ordered authorities to secure emergency beds in nearby hospitals and implement quick rescue operations and treatment, presidential spokesman Lee Jae-Myung told a briefing. Yoon was in an emergency meeting about the situation, the office said in a statement. This is a developing story and will be updated.