An explosion at a hydroelectric power plant in southern Switzerland has left two people seriously injured. A section of the building collapsed following the blast, but the cause of the incident remains unknown at this time. Rescue operations are currently underway at the power plant. Authorities are working to secure the site and assess the full extent of the damage. Further details regarding the injured individuals and the nature of the explosion have not yet been released. Investigations will be launched to determine the cause of the accident at the hydroelectric plant in Switzerland.