The large, deadly explosion at an Iran military base in Iran on Nov. 12, which Iranian authorities have called an accident that set back research work there by a few days, appears to have been far more devastating than their description suggested, according to an analysis of newly released commercial satellite images of the blast site.

The images reveal vast destruction and chaotic disarray across a sprawling complex composed of more than a dozen buildings and large structures.

The Institute for Science and International Security, a private group in Washington, made the satellite images public Monday, along with an analysis of the damage. “It was pretty amazing to see that the entire facility was destroyed,” Paul Brannan, the report’s author, said Tuesday in an interview. “There were only a few buildings left standing.”

It was impossible to determine from the images whether the explosion had been a simple accident or an act of sabotage.

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The force of the explosion was so great that it shook windows in many surrounding towns, according to Iranian news sites and witnesses quoted at the time. But no photographs of the blast damage were released by the Iranian government, which has become increasingly sensitive about its military capabilities as tensions escalate with the West over its missile and nuclear programs.

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The base, set in an isolated patch of Iranian desert ringed by a security cordon, is about 30 miles west of Tehran and three miles west of the town of Bidganeh.