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Ukraine is probing whether a passenger jet that crashed in Iran was shot down by a missile fired from a Russian-built air-defence system.
Photos circulating on social media allegedly show a fragment of a rocket, and posts claim the debris was found near the site where Ukrainian International Airlines flight 752 went down, killing all 176 on board.
Kyiv has sent investigators to Iran and they are probing a number of potential scenarios, including whether the plane was downed by a Russian-made Tor-M1 surface-to-air missile, a type used by Iran's military.