TEHRAN -- Iran's air defenses were activated Thursday night in the southern province of Bushehr, with an "invading" US drone destroyed, Iran's media reported.

The semi-official Tasnim news agency cited a military source as saying that Iran's air defenses intercepted an "invading" US drone near Bushehr by firing missiles.

Meanwhile, the semi-official Fars news agency said Iran's armed forces fired missiles at certain targets from the country's southern regions, with some local sources reporting the possibility of clashes in the Gulf.

Concurrently, the semi-official Mehr news agency said the Iranian armed forces fired warning shots at four vessels near the Strait of Hormuz that sought to cross the waterway without coordination with Iran.

Early Thursday, Iranian media reported three explosions east of the port city of Bandar Abbas.