Bomb-carrying drones targeted an Iranian defense factory in the central city of Isfahan overnight, authorities said early Sunday, causing some damage at the plant amid heightened regional and international tensions engulfing the Islamic Republic.

The Iranian Defense Ministry offered no information on who it suspected carried out the attack, which came as a refinery fire separately broke out in the country’s northwest and a 5.9 magnitude earthquake struck nearby, killing three people.

However, Tehran has been targeted in suspected Israeli drone strikes amid a shadow war with its Mideast rival as its nuclear deal with world powers collapsed. Meanwhile, tensions also remain high with neighboring Azerbaijan after a gunman attacked that country’s embassy in Tehran, killing its security chief and wounding two others.

Details on the Isfahan attack, which happened around 11:30 p.m. Saturday, remained scarce. A Defense Ministry statement described three drones being launched at the facility, with two of them successfully shot down. A third apparently made it through to strike the building, causing “minor damage” to its roof and wounding no one, the ministry said.

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