ISNA | Amir Kholousi & Erfan Khoshkhoo: An explosion from a gas leak in a medical clinic in northern Tehran has killed 19 people, Iranian state TV has reported. Video posted online appeared to show more than one explosion and thick black smoke rising from the Sina At’har clinic. People in nearby Tajrish Bazaar rushed to the scene, impeding a rescue operation, authorities said. Videos on social media showed people gathered outside of the building.