Schools, a hospital and historic landmarks have been severely damaged since US and Israeli strikes on Iran began on Saturday, satellite images and verified videos show, as the number of reported civilian casualties grows.
According to the US-based Human Rights Activists News Agency (HRANA) 1,168 civilians have been killed, including 194 children.
Because of the almost total internet blackout imposed by the authorities, it has been very difficult to speak to people inside Iran, and video footage has been difficult to access.
However, Tehran residents who have been able to connect to the internet say that Thursday night was the most intense night of bombings in the capital and the most frightening by far, with many staying awake all night due to the intensity of strikes.
One described the night as "hell on earth", and another as "a scene from a dystopian film".
