At least 11 Iranians were among those killed in unprecedented Israeli strikes on Syria this week, an activist group said on Saturday.
According to its head Abdel Rahman, among the victims - six Syrian soldiers as well as 21 foreign fighter, including 11 Iranians.
The initial report, which did not include the number of Iranian casualties, was updated "due to the death of wounded or missing persons whose deaths have been confirmed", the observatory's director Rami Abdel Rahman said.
The strikes dramatically ramped up tensions in the region days after US President Donald Trump announced a withdrawal from an global deal that had aimed at easing tensions between Iran and the West.
Iran's foreign minister will embark on a diplomatic tour to try to salvage the nuclear deal amid high tensions following the U.S. withdrawal and global fears over reports of unprecedented clashes with Israel in Syria.
Israel said it destroyed almost all of Iran's military infrastructure in the strikes which were launched in response to 20 missiles fired at the Israeli-occupied Golan Heights.
"Syria will continue to strengthen its air defenses, attempt to interject and down every missile fired by Israel, and target any Israeli air force asset that infringes on Syrian national airspace", he said.
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Israeli forces have been blamed for a series of recent strikes inside Syria that have killed Iranians, though it has not acknowledged those raids.
The cabinet also pointed out that Iran's agenda has changed following Trump's decision to withdraw from the nuclear agreement. However, Iranian President Hassan Rouhani says Tehran will only accept to remain in the nuclear deal if the E3 gives Tehran a guarantee that it will be able to reap all the benefits of JCPOA.
France still hopes for a wider settlement that will cover Iran's activities across the Middle East, and warned Tehran on Thursday "against any temptation for regional dominance".
Syria will further "not hesitate to launch its own retaliatory attacks onto Israeli military positions in accordance with its undisputed right of self-defense and holding the aggressor accountable", he added.
The IDF attacked 50 Iranian targets in 16 locations in Syria in retaliation for Thursday's rocket attack, reportedly killing 27 supporters of the Assad regime.
Trump spoke with British Prime Minister Theresa May on Friday, and "both leaders condemned the Iranian regime's provocative rocket attacks from Syria", the White House said. The global community's silence encourages Israel's aggression. It is reported by the human rights organization Syrian Observatory for human rights (SOHR).
That is despite Israel's claims it struck dozens of Iranian targets inside Syria early on Thursday as part of "Operation House of Cards".