Good morning and welcome to the Guardian's live blog coverage of the bad loss of life after a Ukrainian passenger aircraft crashed shortly after taking off from Tehran - and the new development in the form of claims by western security officials that it was accidentally shot down by an Iranian anti-aircraft missile.
Four Britons were among those killed in the crash on Wednesday morning, which occurred just hours after Iran launched more than a dozen ballistic missiles at two Iraqi military bases housing USA troops.
"The NTSB has designated an accredited representative to the investigation of the crash, involving a Boeing 737-800", the statement said.
The Ukraine International Airlines flight to Kiev from Tehran crashed on Wednesday, when Iran was on alert for a USA military response hours after firing missiles at US targets in Iraq.
His comments came after Boris Johnson suggested there was now a "body of information" that indicated the crash was caused by an Iranian missile.
Although Iran made use of all its facilities to examine the content of the black box inside the country, the content will be sent to France so that any possible damage to the data would be avoided, Hassan Rezaeifar told state news agency IRNA.
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She said it remains to be seen if co-operation will continue, but they believe everyone wants a full understanding of the tragedy. Dutch security investigators recommended more be done to ensure that better protect airspace for civilians in times of conflict.
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Iran said on Friday it wanted to download black box recordings itself from a Ukrainian airliner that crashed, killing all 176 people aboard, after Canada and others said the plane was brought down by an Iranian missile, probably by mistake.
The attack was in retaliation to the assassination - ordered by U.S. president Donald Trump - of top Iranian military leader Qasem Soleimani.
Abedzadeh also said that the plane's pilot had called the control tower prior to turning back toward the airport but that the engine caught fire in mid-air and the plane crashed about two minutes later.
Investigations into airliner crashes can take months and initial reports in 24 hours are rare.
Intelligence officials at the Pentagon said the missiles were likely fired in error by crews on alert for United States response to the Iran rocket strike hours earlier.
Canada's transportation safety board on Thursday said it had accepted an invitation from Iran's civil aviation authority to join the inquiry.