Iranian forces shot down Ukraine International Airlines flight PS752 shortly after its takeoff from Tehran on January 8, 2020, killing all 176 people on board. High alertIranian air defences were on high alert for a US counterattack after Tehran fired missiles at a military base in Iraq that was used by American forces. That same month, an Iranian couple filed a rare lawsuit against three senior Iranian officials over the deaths of their children in the incident, an Iranian newspaper reported at the time