Iran’s nuclear facility at Fordow faced another assault on Monday when Israel launched attacks on routes leading to the subterranean site, following a large-scale U.S. strike over the past 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.

Earlier, Iranian state television mentioned a subsequent strike on Fordow after the U.S. attack but did not specify any details regarding the damage incurred or the perpetrators behind the strike.

This recent attack on Fordow coincides with statements from the IDF confirming that Israel executed multiple attacks targeting the infamous Evin prison and several Iranian military command centers as part of a “continuing effort to diminish the Iranian regime’s military capabilities.”

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.