Ukraine’s national security council has said that 11 Ukrainians had died along with the 82 Iranians on board, Reuters news agency reports.
The flight crashed just after taking off from Imam Khomeini airport in Tehran at 06:12 local time (02:42 GMT) on Wednesday.
It isn’t clear whether the crash was linked in any way to the confrontation with the US.
Three British nationals were among those killed in the crash of a Ukrainian passenger plane in Iran, Ukraine’s Foreign Minister Vadym Prystaiko has said.
There were more than 170 people on board the Boeing-737. Mr Prystaiko said these included:
11 Ukrainians, including all the crew
Ukraine’s embassy in Tehran said engine failure caused the crash and there was no link to terrorism.