What is the cause of the North Korea-China tourist accident?

According to Zhang Feng, Economic Counselor of the Chinese Embassy in North Korea, preliminary investigation results show that the accident may have been caused by technical failure or improper equipment maintenance.

Zhang Feng said that the DPRK attaches great importance to and actively handles the accident and has taken a series of measures, including investigating the cause of the accident, taking technical measures, and strengthening equipment maintenance. At the same time, North Korea has also informed China of the relevant situation and expressed its willingness to assume responsibility for the accident. China expresses its gratitude to the North Korean side for actively handling the accident, and is willing to work with the North Korean side to strengthen equipment maintenance and safety management to ensure the safety of personnel in China and North Korea.