Again?UK sailors captured at gunpoint
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.
That vessel'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 waters.
"I hope we find this is a simple misunderstanding at the tactical level."
Helicopters had reported seeing two British boats being moved to Iranian bases and there had been no evidence of fighting, he added.
He said that despite scant communication, the 15 people were understood to be safe and had reacted in an "extremely professional way, in line with the rules of engagement".
"I look forward to seeing them on their return and congratulating them."
He said naval authorities were doing everything possible to ensure their safe return.
The Ministry of Defence said: "The group boarding party had completed a successful inspection of a merchant ship when they and their two boats were surrounded and escorted by Iranian vessels into Iranian territorial waters.
HMS CORNWALL FACTS
Multi-national force flagship in the northern Gulf
Type 22 frigate
Crew: 250 (Max 301)
Length: 148.1m / 485.9ft
Speed: 30 knots
Source: Royal Navy
"We are urgently pursuing this matter with the Iranian authorities at the highest level.
"The British government is demanding the immediate and safe return of our people and equipment."
Foreign Secretary Margaret Beckett has summoned the Iranian ambassador in London to the Foreign and Commonwealth Office, in an attempt to get the men released as quickly as possible.
In a statement, leader of the Liberal Democrats, Sir Menzies Campbell, also called for their immediate release.
"Whatever the rights and wrongs of military action, British forces in Iraq are now there with the authority of a UN security council resolution... and the Iranian government should be left in no doubt of the serious implications of their action," he said.
The incident comes as British Army Colonel Justin Masherevski, who is based in Iraq, says most of the violence against UK forces in Basra is being engineered by Iranian elements.
Col Masherevski said Iran was providing "sophisticated weaponry" to insurgents and "Iranian agents" were paying local men to attack British troops.
In 2004, Iran detained eight British servicemen for three days after they allegedly strayed over the maritime border.
The UK claimed the men were "forcibly escorted" into Iranian territorial waters.
While they were being held, the men were paraded blindfold and made to apologise on Iranian TV before their release was agreed.
The BBC's diplomatic correspondent James Robbins said the difference this time, and a cause of concern, is that the present Iranian government under President Mahmoud Ahmadinejad was much more hardline.
"The political climate is worse with Britain among those confronting Iran over its controversial nuclear programme," he added.
Fragging Captains sticking to their ROE...
