DUBAI, United Arab Emirates (AP) — 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...