Videos show a number of people being treated on the street by emergency services, surrounded by large crowds.
Social media messages posted earlier in the evening show some people remarking that the Itaewon area was so crowded that it felt unsafeDozens of people are reported to be in cardiac arrest after a reported crush among crowds in a popular nightlife area of South Korea's capital, Seoul.
President Yoon Suk-Yeol ordered disaster responders to the area, where thousands gathered ahead of Halloween.But it is unclear how many people have died, and how many are injured in the incident.But in South Korea, local medical officials are likely to say only that someone is in "cardiac arrest" until there is an official announcement of death by a doctor.There were reportedly 100,000 revellers in the area celebrating the first outdoor no-mask Halloween event since the pandemic.
Photos and videos on social media show a number of both emergency responders and civilians attending to what appear to be unconscious people on the streets.