Western leaders have said that evidence suggested an Iranian missile brought down a Ukrainian passenger plane that crashed near Tehran, possibly in error.
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.
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Victims included 82 Iranians, 63 Canadians and 11 Ukrainians as well as nationals from Sweden, the UK, Afghanistan and Germany.
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.
Video obtained by the New York Times appeared to show a missile streaking across the night sky over Tehran and then exploding on contact with a plane. About 10 seconds later a loud explosion is heard on the ground. The plane, ablaze, continues to fly.
US President Donald Trump said on Thursday that he had “suspicions” about what happened to the plane.
(BBC)
