An explosion occurred in an apartment in Vaasa, Finland, leaving one person with serious injuries. The incident prompted a response from emergency services, who secured the area and attended to the injured individual. Authorities have currently placed four apartments within the building under a usage prohibition, rendering them uninhabitable. The cause of the explosion is currently under investigation, with officials working to determine the source and assess the extent of the damage. Residents of the building are being assisted with temporary accommodation. Further updates will be provided as the investigation progresses and more information becomes available. The situation highlights the potential dangers within residential buildings and the importance of building safety regulations.