Iranian media reports say two more members of a unit of Iran's elite Islamic Revolutionary Guards Corps (IRGC) have been killed in Syria.
The reports on October 24 come only a day after Iranian authorities confirmed two other IRGC deaths in Syria.
Fars news agency reported that Mostafa Sadrzadeh and Milad Mostafavi were killed in the northern Syrian city of Aleppo on October 23 and October 24, respectively, fighting against Islamic State militants.
On October 23, the IRGC confirmed the death of two other Iranian fighters in Syria, including an ex-bodyguard for former Iranian president Mahmud Ahmadinejad.
Iran is the main regional ally of Syrian President Bashar al-Assad and has provided military and economic support during Syria's four-year-old civil war.
The number of Iranian casualties in Syria has risen in recent days.
Based on reporting by Fars and Reuters