More British soldiers forced to make confessions on Iranian TV

The film, broadcast on Al Alam television, showed the two men in uniform in front of a map of the Persian Gulf to which they pointed.

One of the pair, who gave his name as Lieutenant Felix Carman, said: "I would like to say to the Iranian people, 'I can understand why you are so angry about our intrusion into your waters'."

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The release of the footage came after the British Embassy in Tehran was pelted with rocks and firecrackers during a demonstration by students.

Calling for the British ambassador to be expelled from Iran, they chanted "death to Britain" and "death to America" as stones were hurled into the embassy's courtyard.

Around 200 people took part in the protest about the stand-off between Britain and Iran over the 15 sailors and marines captured 10 days ago.

A Foreign Office spokeswoman confirmed there was a police presence outside the embassy, but said nothing had been damaged and nobody had been hurt.

In London, a small group of protestors staged an impromptu demonstration outside the Iranian embassy, calling for the military personnel to be freed.

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The other man shown in the film broadcast was named as Royal Marine Captain Chris Air.

Pointing to the map behind him he said: "Approximately about 10 in the morning we were seized apparently at this point here on their maps, and on the GPS they've shown us, which is inside Iranian territorial waters. That was about 10 o'clock in the morning.

"All members of our team were seized. That's 15 -seven Marines and the remainder, eight, are all Navy.

"So far we have been treated very well by all the people here. They have looked after us and made sure we are given enough food and treated very well by them, so I thank them for that."

The group were captured shortly after conducting a routine early morning anti-smuggling check on a merchant vessel on Friday March 23.

Footage of two members of the group apparently confessing to illegally entering Iranian territory has already been broadcast on TV.

Leading Seaman Faye Turney has featured in several videos and letters, purportedly written by her, have also been released, and Royal Marine Nathan Thomas Summers was shown "apologising" for entering Iranian waters "without permission".

World leaders have stepped in to back Britain in urging Iran to release the group.

Speaking for the first time on the issue, US President George Bush publicly backed Tony Blair's efforts to resolve the situation peacefully, calling the capture "inexcusable behaviour".

During a news conference with Brazilian President Luiz Inacio Lula da Silva, Bush said: "Iran must give back the hostages.

"They're innocent, they did nothing wrong, and they were summarily plucked out of waters." German Chancellor Angela Merkel said Britain had the "full solidarity" of the European Union.

The Foreign Office confirmed their Embassy in Tehran had received and responded to a note from the Iranian government concerning an incident near the Iranian consulate in Basra, Iraq last week, but gave no details.

Iran's state news agency reported the letter protested against an alleged incident in which British troops surrounded the consulate and fired shots in the air.

But the Ministry of Defence said the claims were "completely untrue".

A spokeswoman said: "During a routine patrol by Coalition forces in the As Sarraji district, south of Basra City on Thursday, our forces were fired upon by insurgents and they then returned fire in self defence.

"It is pure coincidence that this took place in the vicinity of the Iranian Consulate."

Defence Secretary Des Browne said the UK Government was in "bilateral communications" with Iran over the captive marines and sailors. Shadow Foreign Secretary William Hague said the Conservatives would continue to support the Government in dealing with the situation in a "calm but determined manner."

Iranian President Mahmoud Ahmadinejad has labelled Britain arrogant for failing to apologise.

But the British Government insists the sailors and Royal Marines were in Iraqi waters when Iranian gunboats seized them.

The European Union has demanded the "immediate and unconditional" release of the prisoners and said Britain could count on its support.

The UN security council expressed its grave concern over the situation, but stopped short of demanding their immediate release.

Other hostages have been named as Royal Marine Corporal Dean Harris, 24, from Carmarthen, west Wales, Paul Barton, of Southport, Merseyside, Royal Marine Adam Sperry, 22, of Leicester, Danny Masterton, 26, of Muirkirk, Ayrshire and Joe Tindell, 21, of south London.