A significant explosion and subsequent fire at a fitness centre in Amsterdam injured seven individuals on Tuesday. One person is in critical condition, while the others sustained varying degrees of injuries. Emergency services responded to the scene and extinguished the blaze, evacuating the building and surrounding areas. The cause of the explosion is currently unknown and under investigation by authorities. Initial reports suggest the blast originated within the fitness studio itself, but further investigation is needed to confirm this. Police have cordoned off the area and are urging the public to avoid it. The incident has prompted a large-scale emergency response and raised concerns about building safety in the area.