An Iranian Army helicopter went down in a fruit market in Isfahan province on Tuesday, leaving the pilot, co-pilot, and two shopkeepers dead, state media reported.
The helicopter crashed down in the city of Dorcheh, causing a fire that was put out by emergency services, the reports added.
The pilot, co-pilot, and two fruit vendors on the ground were killed, the official IRNA news agency said, attributing the crash to "a technical malfunction".
Sanctions-hit Iran has suffered several air disasters in recent years, with officials complaining of difficulties acquiring spare parts to keep its ageing fleets in the air.
Experts say Iran has a poor air safety record, with repeated crashes, many involving aircraft bought before the 1979 Islamic Revolution and lacking original spare parts for maintenance.
Last week, a US-built F-4 fighter belonging to Iran's regular air force crashed in the western province of Hamadan, killing one pilot during a training flight.
