TEHRAN -- At least 555 people have been killed in US and Israeli strikes against Iran since Saturday morning, the Iranian Red Crescent Society (IRCS) said on Monday.

In a statement published on its official website, the IRCS noted that 131 Iranian counties were targeted in the strikes.

More than 100,000 rescuers are on full alert across the country, and relief and rescue operations, as well as the transfer of the wounded to medical centers, are underway, the statement said.

Israel and the United States launched joint attacks on Tehran and several other Iranian cities on Saturday morning, killing the country's Supreme Leader Ali Khamenei as well as some of the leader's family members, top military commanders and civilians. Iran responded through several waves of missile and drone attacks targeting Israel and US bases in the West Asia region.

On Saturday, a girls' school in Iran's southern province of Hormozgan was targeted in the Israeli and US attacks, leaving at least 165 people killed and 95 others wounded, the official news agency IRNA reported.

In addition, a hospital in northern Tehran, in particular its neonatal ward, was damaged in a US-Israeli strike on Sunday night.