https://besacenter.org/perspectives-papers/the-mysterious-explosions-at-irans-nuclear-facilities/
EXECUTIVE SUMMARY: Three incidents, including two explosions at nuclear facilities, have shaken Iran in recent days. Were they connected? Were they caused by accidents or were they carried out by a foreign power? If the latter, were they executed via cyberattack? And what will be their domestic and international implications?
Early in the morning on June 26, Tehran was rocked by a huge explosion at the Parchin military complex, 30 kilometers southeast of the Iranian capital. Some media outlets attributed the blast to Parchin’s role in the development of nuclear weapons, which were reaffirmed when Iran’s secret nuclear research archive was smuggled to Israel and exposed in 2018. The regime’s choice of Parchin as the site at which to conduct nuclear experiments was probably due to the fact that ammunition, explosives, and solid rocket fuel were produced there.
As early as 2012, the International Atomic Energy Agency (IAEA) asked the Iranian authorities to allow its inspectors to tour Parchin following information it had received about nuclear activity at the facility. Its request was rejected. The Iranians then demolished the buildings where the suspect activity had allegedly taken place and even razed the area around them.
In September 2015, after signing the JCPOA nuclear agreement, Tehran finally allowed IAEA inspectors to tour the area and take soil samples. Despite the regime’s thorough sanitizing of the site, anthropogenic (human-processed) uranium particles were found that could only have been produced during “cold test” explosions of nuclear devices.