Iran’s nuclear site at Fordow was hit again on Monday as Israel unleashed strikes on roads leading to the underground facility following a massive U.S. attack over the weekend.

Israel Defense Forces (IDF) said it carried out the attack earlier Monday to disrupt access routes to Fordow, one of Iran’s key enrichment sites.

Iranian state TV had earlier said the site at Fordow sustained a second attack following the U.S. strike over the weekend, though its report did not provide information on any damage or who launched the attack. 

The latest strike on Fordow comes as the IDF said Israel also launched a series of strikes targeting several Iranian military command centers in an “ongoing effort to degrade the Iranian regime’s military capabilities.” Meanwhile, Iran has been firing missiles into Israel in retaliation following the U.S. strike.

Gen. Dan Caine, chairman of the Joint Chiefs of Staff, told reporters during a Pentagon briefing Sunday that while all three Iranian nuclear sites targeted in the strike “sustained extremely severe damage and destruction,” the full battle damage would take time to assess.

Fordow was pictured in satellite images on Sunday showing from a bird’s-eye view that the U.S. strike had obliterated some structures at the site. In satellite images taken days earlier, trucks and vehicles can be seen at the Fordow site.

The IAEA has said off-site radiation levels have not increased following the strikes on three nuclear sites in Iran.

It remained unclear as of Monday whether any enriched nuclear material was destroyed in the U.S. strikes or if Iran had moved the material beforehand.

Fordow is built into the side of a mountain near the city of Qom, about 60 miles southwest of Tehran.

Fox News’ Yonat Friling and The Associated Press contributed to this report.