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 three people briefed on it.

The images are the first look at damage to one of Iran’s main nuclear facilities after American bombers struck that site and two others early Sunday local time.

All three nuclear sites—Fordow, Natanz, and Isfahan—were hit between 6:40pm and 7:05pm EST (1:30am-2:10am local time; 22:40-23:10 GMT). The final wave of Tomahawk missiles struck Isfahan last to preserve surprise.