Iranian warplanes warned off two "coalition vessels" during military drill in waters off the country's southeast, an Iranian general was quoted as saying by Tasnim news agency, controlled by Iran's Islamic Revolution Guard Corps, on Monday.
"This morning and in the early hours of the military drill, two coalition vessels approached the area to monitor Iranian naval forces. Iranian drones identified the vessels, then Iranian planes flew over them and gave them a warning. The vessels left the area," said Rear Admiral Mahmoud Mousavi, the spokesperson for the drills.
The nationality of the vessels is not clear from the brief statement.
The Iranian army is conducting two days of military drills, in an area encompassing 3 million square kilometers, according to a statement published in Iranian media.