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Soaring tensions between Iran and the United States are already complicating the investigation into what caused a Ukrainian passenger jet to crash on the outskirts of Tehran Wednesday, killing all 176 people on board.

Ukrainian International Airlines Flight PS752, a Boeing 737-800, took off from Imam Khomeini airport, climbed to 2,400 meters (7,900 feet) before disappearing from radars and crashing in the southwest outskirts of Tehran. In footage circulated by the state-run Iranian media outlet ISNA, the jet appeared to be burning as it fell from the sky, before exploding on impact with the ground.