Attack happened about 10:30 p.m. local time Sunday, defense ministry says.
State news agency claims “small drones” were to blame for the incident.
Air defense system of the complex was able to destroy two other drones, it says.
Tehran said that a military base in Isfahan, the country’s capital, had been bombed by drones on Sunday.
“An explosion has occurred in one of the military centers affiliated to the Ministry of Defense,” the deputy head of security for Isfahan governorate Mohammad Reza Jan-Nesari told the semi-official News Agency.
Jan-Nesari said the explosion left some damage, “but fortunately there were no casualties.”
Later, the state news agency claimed that “small drones” were to blame for the incident.
“There was an unsuccessful attack by small drones against a defense ministry industrial complex and fortunately with predictions and air defense arrangements already in place, one of them (struck),” local media said in a post on Twitter, citing the country’s defense ministry.
“The air defense system of the complex was able to destroy two other drones. Fortunately, this unsuccessful attack killed no one and minor damage was sustained to the roof of the complex.”
According to the ministry, the attack happened about 10:30 p.m. local time.
About 440 kilometers (270 miles) south of Tehran is where the plant is.
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