US media are reporting that Iran mistakenly shot down the Ukrainian plane that crashed near Tehran with 176 people on board.
CBS says US officials say they believe the Ukrainian International Airlines Boeing 737-800 was hit by a missile.
Ukraine earlier said it was examining whether a missile strike brought down the aircraft - but Iran ruled this out.
The crash came just hours after Iran carried out missile strikes on two airbases housing US forces in Iraq.
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 the Ukrainian plane 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.
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