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Evidence suggests an Iranian missile brought down a Ukrainian passenger plane that crashed near Tehran, possibly in error, Western leaders say.
The leaders of Canada and the UK called for a full and thorough investigation into the crash, which killed all 176 people on board.
Iran has ruled out a missile strike by its air defences.
The crash came just hours after Iran carried out missile strikes on two airbases housing US forces in Iraq.
US media have speculated that the timing of the crash suggests the plane may have been mistaken for a US warplane as Iran prepared for possible US retaliation for the strikes.
CBS News quoted US intelligence sources as saying a satellite detected infrared "blips" of two missile launches, followed by another blip of an explosion.
Meanwhile, Newsweek quoted a Pentagon and senior US intelligence officials, as well as an Iraqi intelligence official, as saying they believed Ukraine International Airlines flight PS752 was hit by a Russian-made Tor missile.
US President Donald Trump said on Thursday that he had "suspicions" about what happened to the plane.
Amid tensions heightened by the US killing of top Iranian general Qasem Soleimani on 3 January, Iran initially said it would not hand over the recovered black box flight recorders to Boeing, the plane's manufacturer, or to the US.
However, an Iranian official later told Reuters the US had been formally invited to take part in the investigation, and the US National Transportation Safety Board (NTSB) confirmed it had assigned an investigator.
Boeing said it would support the NTSB in the inquiry, and the Transportation Safety Board of Canada said it had also been invited to the accident site by Tehran.
The leaders of Canada and the UK called for a full and thorough investigation into the crash, which killed all 176 people on board.
Iran has ruled out a missile strike by its air defences.
The crash came just hours after Iran carried out missile strikes on two airbases housing US forces in Iraq.
US media have speculated that the timing of the crash suggests the plane may have been mistaken for a US warplane as Iran prepared for possible US retaliation for the strikes.
CBS News quoted US intelligence sources as saying a satellite detected infrared "blips" of two missile launches, followed by another blip of an explosion.
Meanwhile, Newsweek quoted a Pentagon and senior US intelligence officials, as well as an Iraqi intelligence official, as saying they believed Ukraine International Airlines flight PS752 was hit by a Russian-made Tor missile.
US President Donald Trump said on Thursday that he had "suspicions" about what happened to the plane.
Amid tensions heightened by the US killing of top Iranian general Qasem Soleimani on 3 January, Iran initially said it would not hand over the recovered black box flight recorders to Boeing, the plane's manufacturer, or to the US.
However, an Iranian official later told Reuters the US had been formally invited to take part in the investigation, and the US National Transportation Safety Board (NTSB) confirmed it had assigned an investigator.
Boeing said it would support the NTSB in the inquiry, and the Transportation Safety Board of Canada said it had also been invited to the accident site by Tehran.
