China News Service, August 31. According to foreign media reports, on the 30th local time, after a party was held in an underground building in Oslo, the capital of Norway, at least 25 people were sent to hospital for treatment suspected of carbon monoxide poisoning.

  According to reports, in the early morning of the 30th, the police patrol encountered a group of young people who seemed unconscious near the underground building where the incident occurred. Several people later came out of the building and asked for the help of an ambulance.

  Oslo police said that about 200 people participated in the carnival and entered the underground building illegally. The police urged other participants in the party to seek immediate medical attention if they start to feel nausea, headache or dizziness.

  According to reports, the authorities believe that the poisoning was caused by a portable generator. Currently, 5 people are in critical condition, but no lives are in danger. The chief physician of Oslo University Hospital, Haydar, said: "Fortunately, they are all getting better. We can say that they are out of danger."

  The report pointed out that the Oslo police had received early warning of this carnival, but they are investigating why they did not follow up.