The Iranian government has called Sunday's helicopter crash that killed President Ebrahim Raisi and Foreign Minister Hossein Amir-Abdollahian an accident. Officials have attributed the tragedy to bad weather conditions and technical failure. The crash occurred at a time of rising tensions in the Middle East. What more do we know about the accident? How will Iran fill the power vacuum? And how might this influence Iran’s domestic and international policies as well as its involvement in the region?