OTTAWA—A human rights group says in a new report that Iran has harassed families of passengers killed aboard Ukraine International Airlines Flight 752. Human Rights Watch says from last fall until January it spoke with 31 family members of victims and “people with direct knowledge” of how Iranian authorities treated relatives. In all, 176 people were killed when an Iranian surface-to-air missile shot down a passenger jet destined for Kyiv minutes after takeoff from Tehran on Jan. 8, 2020. Among the dead were 55 Canadians and 30 permanent residents. Human Rights Watch says those it spoke with say Iranian security agencies have mistreated victims’ families through arbitrary detainment, interrogation and intimidation. It reports 16 people said security officials threatened them not to speak with foreign media or followed relatives and friends who attended memorials. “Family members said that in several instances, the authorities interfered with burial and memorial services, pressuring …