An airstrike hit a residential building in city southwest of Iran's capital Tehran, killing at least 13 people, according to Iranian media.

The semiofficial Fars news agency and Nour News reported the strike near Eslamshahr.

The reason for the attack remains unclear. Neither Israel nor United States have claimed responsibility. The strike comes shortly after US President Donald Trump issued a profanity-laced warning demanding that Iran reopen the Strait of Hormuz.