Bodies of 30 fighters belonging to the militant group Hezbollah arrived in Lebanon from Syria, Syrian opposition sources told Al Arabiya on Monday.
The sources added that Al-Quds Brigade commander, whose known by his nickname, Abu Ajeeb, was also killed in Syria in battles against rebels.
Reports have emerged that members of the Lebanese Shiite group were fighting with forces loyal to Syrian President Bashar al-Assad against rebels.
Former Hezbollah chief Subhi al-Tufaili told Al Arabiya in an interview earlier this week that at least 138 Hezbollah fighters have been killed in the Syria fighting.
Tufaili added that Hezbollah, who is backed by Iran and the Syrian regime, was told to fight with the Assad forces in direct orders from Tehran.
However, the Shiite group has repeatedly stated that it was not taking part in the fighting in Syria.
h/t Michael Ross