Brainroom Facts: U.K. Sailors, Marines Held in Iran

Complete timeline of Iran-U.K. Royal Navy standoff:

March 23:

15 Royal Navy sailors and Marines from HMS Cornwall are seized by Iranian warships after searching a cargo boat in the Gulf.

Iranian state television reports the Britons are being held after entering Iranian waters, but the UK insists the group were within Iraqi boundaries.

Iran's ambassador in London, Rasoul Movahedian, meets UK Foreign Office permanent secretary Sir Peter Ricketts. In Tehran, UK diplomats are summoned for talks.

March 24:

A Tehran news agency says the group admits sailing into Iran waters and GPS systems on the UK boats prove this.

Foreign Office minister Lord Triesman meets the Iranian ambassador in London to demand the group's immediate release.

March 25:

Hardliners around Iran's president demand the 15 go on trial.

In his first remarks on the incident, Tony Blair says it is "serious" and calls for a swift end to the "unjustified and wrong" detention.

The U.K. says it has not been told where the 15 personnel are being held. British ambassador Geoffrey Adams presses for consular access.

March 26:

Iran says the 15 are being questioned but were not taken in exchange for Iranians held by the US in Iraq.

The UK holds a third meeting with Iran's ambassador. In Tehran, the British ambassador is assured the missing personnel are "fit and well".

March 27:

Tony Blair talks of a "different phase" in diplomatic efforts if current moves fail. The 15 were in Iraqi waters under a UN mandate, he adds.

The BBC is told the group are being held in Tehran, where Iran says they are being treated humanely.

March 28:

Iranian state television broadcasts an interview with Faye Turney and footage of the servicemen. They had "obviously" trespassed but their captors had been friendly, she says.

The Royal Navy presents GPS evidence it says proves the group were 1.7 nautical miles inside Iraqi waters when they were seized.

March 29:

Iran releases video footage which it says shows the British crew being seized in Iranian waters. Alongside is a military briefing showing charts which pinpoint their supposed location.

Any moves to release Leading Seaman Faye Turney are frozen - Iran blames the UK's "incorrect attitude".

A second letter apparently written by LS Turney is released which calls on the UK to withdraw troops from Iraq. Downing Street calls her treatment "cruel and callous".

March 30:

Iranian TV broadcasts an interview with a second crewman, Nathan Summers, who apologises for "trespassing" in Iranian waters.

Iran releases a third letter allegedly from Leading Seaman Faye Turney in which she said she had been "sacrificed" to the policies of the UK and US governments.

March 31:

US officials rule out a deal to exchange the Royal Navy personnel captured in the Gulf for five Iranians seized by American forces in Iraq.

Iranian President Mahmoud Ahmadinejad criticises Britain's response to the crisis.

April 1:

Iranian state television airs new footage of two of the Royal Navy personnel who were captured.

They are shown separately standing in front of a chart of the northern Gulf where the sailors and marines were seized.

The Foreign Office describes showing the TV footage as "unacceptable".

April 2:

Tony Blair's spokesman says there is "a lot going on behind the scenes", and Iran needs to show "where it stands".

April 3:

For the first time since the incident, The U.K. government had direct contact with Iran's Supreme National Security Council chief Ali Larijani.

April 4:

President Mahmoud Ahmadinejad said 15 Britons seized 13 days ago are to be pardoned and released for the prophet Muhammad's birthday

Ahmadinejad said the Britons would be released immediately and taken to an airport. Ahmadinejad calls it a 'gift' to the British people.

April 5:

15 British sailors touched down on British soil ending 13 days in captivity in Iran

A British Airways passenger jet carried the crew from Tehran to Heathrow Airport

[source: BBC News // Wire Reports]