1038 GMT October 31, 2020
"Security investigations confirm that the move was an act of sabotage, and what is certain is that an explosion took place at Natanz," Behrouz Kamalvandi said in an exclusive interview with Al-Alam news network on Sunday.
He added that Iranian security officials will reveal "in due time" more details about the explosion, including how it took place and what explosives were used, Press TV wrote.
On July 2, Iran said an incident affected a shed under construction at the Natanz complex, but it caused no casualties and failed to stop enrichment work at the facility.
Iran's Supreme National Security Council (SNSC) said later that the "main cause" of the incident at the country’s Natanz nuclear facility has been determined and will be announced at an appropriate time.
SNSC spokesman Keyvan Khosravi said that experts from different sectors started investigating "different hypotheses" about the incident at the Natanz site in central Iran immediately after its occurrence, and have determined its main cause.
"Due to some security considerations, the cause and manner of this incident will be announced at a proper time," he added.
Elsewhere in his remarks, Kamalvandi stated that Iran is currently producing more than three tons of heavy water, part of which is exported to other countries, including some European countries. He, however, refused to name those European countries, so that they would not come under pressure from the United States.