Dozens of people are reported to be in cardiac arrest in a popular night spot in South Korea's capital, Seoul.
President Yoon Suk-Yeol ordered a disaster response team to Itaewon, Yongsan-gu district.
The fire department said there had been 81 reports of "shortness of breath" amid reports of a crush.
There were reportedly 100,000 night revellers in the area celebrating the first outdoor no-mask Halloween event since the pandemic.
Video footage shows a number of people being treated on the street by emergency services, surrounded by large crowds.
The streets of Seoul were full of people celebrating Halloween.
Social media messages posted earlier in the evening show some people remarking that the Itaewon area was so crowded that it felt unsafe.
https://www.bbc.com/news/world-asia-63440849
