The Human Rights Activist News Agency based in the United States (Hrana) said on Friday that at least 657 people had been killed in Iran after a massive Israeli bombing campaign launched a week ago.
Hrana also revealed in a report that 2,037 had been injured in national air strikes.
However, the Iranian government did not issue a daily number of victims.
Hrana relies on an extensive informant network and the source available to the public for his report.
The group said the dead were among at least 263 civilians and 164 military members.
230 other deaths are still not identified.
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The network also reports damage to civil infrastructure, including projectiles that attack children’s hospitals in Tehran, which do not cause injury.
In the western province of ILAM, a firefighting station was damaged, said Hrana, while Israel’s attack at a car factory in West Iran triggered a large fire.
Israel stated that the aim was to prevent Iran from obtaining nuclear weapons, which he considered as an existential threat.