Photos and videos from the crash site showed rescuers in a field littered with plane debris, smoldering fires and the personal belongings of passengers. The Iranian Students’ News Agency, a state-run media organization, shared a video it said showed the predawn crash, with a distant light descending in the distance before a bright burst filled the sky upon impact.

Qassem Biniaz, an official at the Iranian Ministry of Roads and Urban Development, told the Islamic Republic News Agency, the government’s official news agency, that an engine caught fire and the pilot was unable to regain control. Ukraine International Airlines Flight 752 left Imam Khomeini International Airport in Tehran at 6:12 a.m. on Wednesday and lost contact at 6:14 a.m., according to a flight tracker.