The US military strikes on three of Iran’s nuclear facilities last weekend did not destroy the core components of the country’s nuclear program and likely only set it back by months, according to an early US intelligence assessment that was described by seven people briefed on it.

Satellite images analyzed by The New York Times show the extent of damage at the three nuclear facilities hit by the United States. Fordo is Iran’s most critical nuclear enrichment facility, housed deep inside a mountain to shield it from attacks.