Iran said on Tuesday it had arrested "several" suspects accused of playing a role in the shooting down of a Ukrainian passenger plane near Tehran last week that killed all 176 passengers on board.

Iran's President Hassan Rouhani said Tuesday the crash of flight PS752 was an "unforgivable mistake" by the country's military. After days of denying blame for the crash, Iran acknowledged on Saturday it had shot the plane down during a state of high alert.

Global's Crystal Goomansigh has the latest update on the crash investigation from Kyiv.

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