The Iranian Ministry of Defense said that it thwarted an attack with three drones that targeted a military factory in Isfahan province, in the center of the country.
The ministry added that the Iranian anti-aircraft missiles responded to the three marches, and the damage was limited to the roof of a military factory.
Earlier, the Iranian Radio and Television Corporation reported on its website that a strong explosion was heard at a military factory in the city of Isfahan, central Iran.
"The explosion occurred in one of the ammunition manufacturing centers of the Ministry of Defense, and according to the announcement of the political and security deputy to the head
of Isfahan province, there were no injuries," the agency said.
"The damage is being inspected and the causes and elements that caused this explosion
are being investigated, and... they will be announced later," security official Mohammad Reza Genisar told state television later.
A number of explosions and fires have occurred around Iranian military, nuclear and industrial facilities in the past few years.
The explosions have raised concerns at times, given the state of tension with Israel and the United States over Iran's nuclear programme.
Israel has long threatened military action against Iran if indirect talks between Washington and Tehran fail to salvage
the 2015 nuclear deal.