Fifteen British Navy personnel have been captured at gunpoint by Iranian forces, the Ministry of Defence says.
The men were seized at 1030 local time when they boarded a boat in the Gulf, off the coast of Iraq, which they suspected was smuggling cars.
The Royal Navy said the men, who were on a routine patrol in Iraqi waters, were understood to be unharmed.
The Foreign Office has demanded the immediate and safe return of the men, who are based on HMS Cornwall.
The frigate's commander, Commodore Nick Lambert, said he was hoping there had been a "simple mistake" over territorial waters.
"There is absolutely no doubt in my mind that they [British personnel] were in Iraqi territorial waters. Equally, the Iranians may claim they were in Iranian territorial waters.
"We may well find that this is a simple misunderstanding at the tactical level."
Helicopters had reported seeing two British boats being moved along the Shatt al-Arab waterway to Iranian bases and there had been no evidence of fighting, he added.
dont like the look of this.....................
The men were seized at 1030 local time when they boarded a boat in the Gulf, off the coast of Iraq, which they suspected was smuggling cars.
The Royal Navy said the men, who were on a routine patrol in Iraqi waters, were understood to be unharmed.
The Foreign Office has demanded the immediate and safe return of the men, who are based on HMS Cornwall.
The frigate's commander, Commodore Nick Lambert, said he was hoping there had been a "simple mistake" over territorial waters.
"There is absolutely no doubt in my mind that they [British personnel] were in Iraqi territorial waters. Equally, the Iranians may claim they were in Iranian territorial waters.
"We may well find that this is a simple misunderstanding at the tactical level."
Helicopters had reported seeing two British boats being moved along the Shatt al-Arab waterway to Iranian bases and there had been no evidence of fighting, he added.
dont like the look of this.....................