A raging inferno erupted at a new water park in Sweden on Monday, with flames decimating a number of under-construction outdoor waterslides and related facilities, authorities said. The massive blaze ripped through several yet-to-be-opened waterslides, including one with a drop of 43 feet, at the Oceana waterpark in Goteberg — sending plumes of black smoke over Sweden’s second-largest city. Harrowing footage shot by witnesses showed the slides, which had been scheduled to open in the coming months, engulfed by flames as several firefighting vehicles descended on the area. At least three explosions sent debris from nearby buildings scattering over the...