The map created using a simulation tool shows the devastating impact of a hypothetical U.S. nuclear strike on Tehran, Isfahan, and Qom.

Iran doesn’t have nuclear weapons. But it has enriched nuclear fuel to levels that put it within weeks of having enough fissile material for a bomb. Still, Iran hasn’t proved it can build a reliable nuclear device or miniaturize one to fit atop a ballistic missile.

When Israel launched its series of strikes against Iran last week, it also issued a number of dire warnings about the country’s nuclear program, suggesting Iran was fast approaching a point of no return in its quest to obtain nuclear weapons and that the strikes were necessary to preempt that outcome.