Fifteen British sailors and Marines were seized by Iran in internationally disputed waters and not in Iraqs maritime territory as Parliament was told, according to new official documents released to The Times.
The Britons were seized because the US-led coalition designated a sea boundary for Irans territorial waters without telling the Iranians where it was, internal Ministry of Defence briefing papers reveal.
Documents released under the Freedom of Information Act detail for the first time the blunders last spring that led to what an all-party committee of MPs came to describe as a national embarrassment.
The captured 14 men and one woman were paraded on Iranian TV for a fortnight before being freed a year ago by a smiling President Ahmadinejad, who gave them new suits and bags of presents.
Newly released Ministry of Defence documents state that:
The arrests took place in waters that are not internationally agreed as Iraqi;
The coalition unilaterally designated a dividing line between Iraqi and Iranian waters in the Gulf without telling Iran where it was;
The Iranian Revolutionary Guards coastal protection vessels were crossing this invisible line at a rate of three times a week; It was the British who apparently raised their weapons first before the Iranian gunboats came alongside;
The cornered British, surrounded by heavily armed Iranians, made a hopeless last-minute radio plea for a helicopter to come back and provide air cover.
Iran always claimed that it had arrested the Britons for violating its territorial integrity.
Des Browne, the Defence Secretary, repeatedly told the Commons that the personnel were seized in Iraqi waters.
The MoD, in a televised briefing by Vice-Admiral Charles Style, the Deputy Chief of the Defence Staff, produced a map showing a line in the sea called Iraq/Iran Territorial Water Boundary. A location was given for the capture of the Britons inside what the chart said were Iraq territorial waters. But the newly released top-level internal briefing accepts that no such border exists.
The report, addressed to Air Chief Marshal Sir Jock Stirrup, the Chief of the Defence Staff, blames the incident on the absence of an agreed boundary and a failure to coordinate between Iraq, Iran and the coalition.
Under the heading Why the incident occurred, the report examines the history of a border that has been disputed since a treaty between the Persian and Ottoman empires in 1639.
Professor Robert Springborg, of the School of Oriental and African Studies, said yesterday that it was negligent to fail to clarify with the Iranians where the notional boundary was.
Using the Freedom of Information Act, The Times made requests about the events. The MoD released two documents, although parts are censored. One is the report to Sir Jock dated April 13, 2007, a week after the Britons returned home unharmed. It was compiled after they had been debriefed. The other is the communications log between the mother ship HMS Cornwall and the two seaboats used by the boarding party.