President Donald Trump says the US Navy destroyed an Iranian drone in the Strait of Hormuz.
He said the USS Boxer amphibious assault ship “took defensive action” after the drone came within about 1,000 yards of the vessel.
Iran said it had no information about losing a drone. In June, Iran downed a US military drone in the area.
Earlier, Tehran said it had seized a “foreign tanker” and its 12 crew on Sunday for smuggling fuel in the Gulf.
Iran has been blamed by the US for attacks on tankers which have happened in the world’s key shipping area since May. Tehran denies all the accusations.
The recent incidents have triggered fears of a military conflict in the region