Why was Seoul's tragic Halloween event so inadequately policed?

In South Korea, along with the grief, there's now growing anger. More than one hundred and fifty people are known to have died on Saturday evening, after Halloween revellers were caught in a crush in the capital Seoul. Most of the victims were in their 20s.

South Korean President Yoon Suk-yeol and cabinet members pay tribute to the victims of the Halloween celebration stampede Source: Getty / Chung Sung-Jun/Getty Images

This item was first produced for the BBC World Service