Deafening boom, vague explanation: What really happened in Iran’s Isfahan as IRGC offers no clues

Iran's Isfahan was rattled by a mystery explosion as tensions with the United States remain elevated over the Strait of Hormuz. The August 23 blast was reportedly heard across several areas of southern Isfahan, including Soffeh and Baharestan, quickly raising questions about what had happened. The IRGC later described the incident as a controlled explosion rather than an attack. However, reports offered no explanation for what was detonated or why, while information about possible damage or casualties was also absent. Amid the Trump-Tehran standoff, what exactly caused the mysterious last?