Tehran insists the Fordow nuclear stronghold - a key target in the June 21 attack - was almost completely unsold and had no radioactive leaks.
Speaking to domestic media, Mohammad Manan Raeisi, a lawmaker representing the province of Qom, where the Fordow facility is located, affirmed: Only a few structures on the ground were slightly damaged. The sensitive materials were completely evacuated before the attack took place.
He emphasized: There was no radioactive leak. The entire facility is still in a state of safety control". At the same time, Mr. Raeisi also condemned what he called "provocational and foolish" US actions, warning Iran to reserve the right to retaliate.
A local official in Qom also confirmed the attack, but said only a small part of Fordow was affected, with insignificant damage.
Iran's nuclear power organization condemned the airstrikes as unreasonable and serious violations of international law as well as commitments not to disseminate nuclear weapons.
The organization stressed that Iran's nuclear program is purely for peaceful purposes and warned that military actions will have consequences.
Earlier, satellite images from Maxar Technologies showed Iran had reinforced the Fordow just days before it was attacked. Photo taken on June 19 - two days before the attack - shows rocks and soil piled up at the two main entrances of the underground facility, along with many trucks and excavators in operation.
On June 20, the next satellite image recorded the access road to the facility covered with soil, with trucks and excavators continuing to operate near the tunnel area, showing Iran's efforts to increase defense capabilities.
The Fordow was built deep in the mountains, at a depth of 80-90m underground, which was the reason why the US had to use large-sized penetrating bombs weighing more than 13 tons to attack.
According to data from NASA's Fire Information Management System (FIRMS), two heat signals were recorded at Fordow at 2:49 and 2:54 a.m. on June 21, coinciding with the time when President Trump declared the "completely destruction" of Iranian nuclear facilities.
However, Iran has denied the information. Mr. Raisie said that what is mainly affected is the ground clearance, which can be completely restored. "Contrary to the US President's lie, the Fordow facility has not suffered any serious losses," said Mr. Raeisi.
Iran's National Nuclear Safety Administration also issued a statement reassuring public opinion, saying that radiation measuring devices did not record any leakage after the attack at three locations of Fordow, Natanz and Isfahan.
At the same time, the Saudi Arabian Nuclear Regulatory Authority announced that there were no radioactive traces in the environment in the country or Gulf countries.